Moving notification types which are chrome specific to a new header file chrome_notification_type...

content/common/content_notification_types.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_COMMON_NOTIFICATION_TYPE_H_
 #define CONTENT_COMMON_NOTIFICATION_TYPE_H_
 #pragma once
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
 //
-// It is written as an enum inside a class so that it can be forward declared.
-// You're not allowed to forward declare an enum, and we want to forward
-// declare this since it's required by NotificationObserver which is included
-// by a lot of header files.
-//
-// Since this class encapsulates an integral value, it should be passed by
-// value.
-class NotificationType {
- public:
-  enum Type {
-    // General -----------------------------------------------------------------
-
-    // Special signal value to represent an interest in all notifications.
-    // Not valid when posting a notification.
-    ALL = 0,
-
-    // The app is done processing user actions, now is a good time to do
-    // some background work.
-    IDLE,
-
-    // Means that the app has just started doing something in response to a
-    // user action, and that background processes shouldn't run if avoidable.
-    BUSY,
-
-    // This is sent when the user does a gesture resulting in a noteworthy
-    // action taking place. This is typically used for logging. The source is
-    // the profile, and the details is a string identifying the action.
-    USER_ACTION,
-
-    // NavigationController ----------------------------------------------------
-
-    // A new pending navigation has been created. Pending entries are created
-    // when the user requests the navigation. We don't know if it will actually
-    // happen until it does (at this point, it will be "committed." Note that
-    // renderer- initiated navigations such as link clicks will never be
-    // pending.
-    //
-    // This notification is called after the pending entry is created, but
-    // before we actually try to navigate. The source will be the
-    // NavigationController that owns the pending entry, and there are no
-    // details.
-    NAV_ENTRY_PENDING,
-
-    // A new non-pending navigation entry has been created. This will
-    // correspond to one NavigationController entry being created (in the case
-    // of new navigations) or renavigated to (for back/forward navigations).
-    //
-    // The source will be the navigation controller doing the commit. The
-    // details will be NavigationController::LoadCommittedDetails.
-    NAV_ENTRY_COMMITTED,
-
-    // Indicates that the NavigationController given in the Source has
-    // decreased its back/forward list count by removing entries from either
-    // the front or back of its list. This is usually the result of going back
-    // and then doing a new navigation, meaning all the "forward" items are
-    // deleted.
-    //
-    // This normally happens as a result of a new navigation. It will be
-    // followed by a NAV_ENTRY_COMMITTED message for the new page that
-    // caused the pruning. It could also be a result of removing an item from
-    // the list to fix up after interstitials.
-    //
-    // The details are NavigationController::PrunedDetails.
-    NAV_LIST_PRUNED,
-
-    // Indicates that a NavigationEntry has changed. The source will be the
-    // NavigationController that owns the NavigationEntry. The details will be
-    // a NavigationController::EntryChangedDetails struct.
-    //
-    // This will NOT be sent on navigation, interested parties should also
-    // listen for NAV_ENTRY_COMMITTED to handle that case. This will be
-    // sent when the entry is updated outside of navigation (like when a new
-    // title comes).
-    NAV_ENTRY_CHANGED,
-
-    // Other load-related (not from NavigationController) ----------------------
-
-    // Corresponds to ViewHostMsg_DocumentOnLoadCompletedInMainFrame. The source
-    // is the TabContents and the details the page_id.
-    LOAD_COMPLETED_MAIN_FRAME,
-
-    // A content load is starting.  The source will be a
-    // Source<NavigationController> corresponding to the tab in which the load
-    // is occurring.  No details are expected for this notification.
-    LOAD_START,
-
-    // A content load has stopped. The source will be a
-    // Source<NavigationController> corresponding to the tab in which the load
-    // is occurring.  Details in the form of a LoadNotificationDetails object
-    // are optional.
-    LOAD_STOP,
-
-    // Content was loaded from an in-memory cache.  The source will be a
-    // Source<NavigationController> corresponding to the tab in which the load
-    // occurred.  Details in the form of a LoadFromMemoryCacheDetails object
-    // are provided.
-    LOAD_FROM_MEMORY_CACHE,
-
-    // A provisional content load has failed with an error.  The source will be
-    // a Source<NavigationController> corresponding to the tab in which the
-    // load occurred.  Details in the form of a ProvisionalLoadDetails object
-    // are provided.
-    FAIL_PROVISIONAL_LOAD_WITH_ERROR,
-
-    // A response has been received for a resource request.  The source will be
-    // a Source<RenderViewHostDelegate> corresponding to the tab in which the
-    // request was issued.  Details in the form of a ResourceRequestDetails
-    // object are provided.
-    RESOURCE_RESPONSE_STARTED,
-
-    // A redirect was received while requesting a resource.  The source will be
-    // a Source<RenderViewHostDelegate> corresponding to the tab in which the
-    // request was issued.  Details in the form of a ResourceRedirectDetails
-    // are provided.
-    RESOURCE_RECEIVED_REDIRECT,
-
-    // A new window is created in response to a request from a renderer. The
-    // source will be a Source<TabContents> corresponding to the tab the
-    // request originates from.  Details in the form of a
-    // ViewHostMsg_CreateWindow_Params object are provided.
-    CREATING_NEW_WINDOW,
-
-    // A new window was requested but was not created. The source will be a
-    // Source<TabContents> corresponding to the tab the request originated from.
-    // Details are the ViewHostMsg_CreateWindow_Params object that were used in
-    // the request.
-    CREATING_NEW_WINDOW_CANCELLED,
-
-    // SSL ---------------------------------------------------------------------
-
-    // Updating the SSL security indicators (the lock icon and such) proceeds
-    // in two phases:
-    //
-    // 1) The internal SSL state for a host or tab changes.  When this happens,
-    //    the SSLManager broadcasts an SSL_INTERNAL_STATE_CHANGED notification.
-    //
-    // 2) The SSLManager for each tab receives this notification and might or
-    //    might not update the navigation entry for its tab, depending on
-    //    whether the change in state affects that tab.  If the SSLManager does
-    //    change the navigation entry, then the SSLManager broadcasts an
-    //    SSL_VISIBLE_STATE_CHANGED notification to the user interface can
-    //    redraw properly.
-
-    // The SSL state of a page has changed in some visible way.  For example,
-    // if an insecure resource is loaded on a secure page.  Note that a
-    // toplevel load commit will also update the SSL state (since the
-    // NavigationEntry is new) and this message won't always be sent in that
-    // case.  Listen to this notification if you need to refresh SSL-related UI
-    // elements.
-    //
-    // There is no source or details.
-    SSL_VISIBLE_STATE_CHANGED,
-
-    // The SSL state of the browser has changed in some internal way.  For
-    // example, the user might have explicitly allowed some broken certificate
-    // or a secure origin might have included some insecure content.  Listen to
-    // this notifiation if you need to keep track of our internal SSL state.
-    //
-    // The source will be the navigation controller associated with the state
-    // change.  There are no details.
-    SSL_INTERNAL_STATE_CHANGED,
-
-    // The user accepted or dismissed a SSL client authentication request.
-    // The source is a Source<SSLClientAuthHandler>.  Details is a
-    // SSLClientAuthNotificationDetails which records specifies which
-    // SSLCertRequestInfo the request was for and which X509Certificate was
-    // selected (if any).
-    SSL_CLIENT_AUTH_CERT_SELECTED,
-
-    // Views -------------------------------------------------------------------
-
-    // Notification that a view was removed from a view hierarchy.  The source
-    // is the view, the details is the parent view.
-    VIEW_REMOVED,
-
-    // Browser-window ----------------------------------------------------------
-
-    // This message is sent after a window has been opened.  The source is a
-    // Source<Browser> containing the affected Browser.  No details are
-    // expected.
-    BROWSER_OPENED,
-
-    // This message is sent soon after BROWSER_OPENED, and indicates that
-    // the Browser's |window_| is now non-NULL. The source is a Source<Browser>
-    // containing the affected Browser.  No details are expected.
-    BROWSER_WINDOW_READY,
-
-    // This message is sent when a browser is closing. The source is a
-    // Source<Browser> containing the affected Browser. Details is a boolean
-    // that if true indicates that the application will be closed as a result of
-    // this browser window closure (i.e. this was the last opened browser
-    // window on win/linux). This is sent prior to BROWSER_CLOSED, and may be
-    // sent more than once for a particular browser.
-    BROWSER_CLOSING,
-
-    // This message is sent after a window has been closed.  The source is a
-    // Source<Browser> containing the affected Browser.  Details is a boolean
-    // that if true indicates that the last browser window has closed - this
-    // does not indicate that the application is exiting (observers should
-    // listen for APP_TERMINATING if they want to detect when the application
-    // will shut down). Note that the boolean pointed to by details is only
-    // valid for the duration of this call.
-    BROWSER_CLOSED,
-
-    // This message is sent when the last window considered to be an
-    // "application window" has been closed. Dependent/dialog/utility windows
-    // can use this as a way to know that they should also close. No source or
-    // details are passed.
-    ALL_APPWINDOWS_CLOSED,
+namespace content {
+
+enum {
+  NOTIFICATION_CONTENT_START = 0,
+
+  // General -----------------------------------------------------------------
+
+  // Special signal value to represent an interest in all notifications.
+  // Not valid when posting a notification.
+  NOTIFICATION_ALL = NOTIFICATION_CONTENT_START,
+
+  // The app is done processing user actions, now is a good time to do
+  // some background work.
+  NOTIFICATION_IDLE,
+
+  // Means that the app has just started doing something in response to a
+  // user action, and that background processes shouldn't run if avoidable.
+  NOTIFICATION_BUSY,
+
+  // This is sent when the user does a gesture resulting in a noteworthy
+  // action taking place. This is typically used for logging. The source is
+  // the profile, and the details is a string identifying the action.
+  NOTIFICATION_USER_ACTION,
+
+  // NavigationController ----------------------------------------------------
+
+  // A new pending navigation has been created. Pending entries are created
+  // when the user requests the navigation. We don't know if it will actually
+  // happen until it does (at this point, it will be "committed." Note that
+  // renderer- initiated navigations such as link clicks will never be
+  // pending.
+  //
+  // This notification is called after the pending entry is created, but
+  // before we actually try to navigate. The source will be the
+  // NavigationController that owns the pending entry, and there are no
+  // details.
+  NOTIFICATION_NAV_ENTRY_PENDING,
+
+  // A new non-pending navigation entry has been created. This will
+  // correspond to one NavigationController entry being created (in the case
+  // of new navigations) or renavigated to (for back/forward navigations).
+  //
+  // The source will be the navigation controller doing the commit. The
+  // details will be NavigationController::LoadCommittedDetails.
+  NOTIFICATION_NAV_ENTRY_COMMITTED,
+
+  // Indicates that the NavigationController given in the Source has
+  // decreased its back/forward list count by removing entries from either
+  // the front or back of its list. This is usually the result of going back
+  // and then doing a new navigation, meaning all the "forward" items are
+  // deleted.
+  //
+  // This normally happens as a result of a new navigation. It will be
+  // followed by a NAV_ENTRY_COMMITTED message for the new page that
+  // caused the pruning. It could also be a result of removing an item from
+  // the list to fix up after interstitials.
+  //
+  // The details are NavigationController::PrunedDetails.
+  NOTIFICATION_NAV_LIST_PRUNED,
+
+  // Indicates that a NavigationEntry has changed. The source will be the
+  // NavigationController that owns the NavigationEntry. The details will be
+  // a NavigationController::EntryChangedDetails struct.
+  //
+  // This will NOT be sent on navigation, interested parties should also
+  // listen for NAV_ENTRY_COMMITTED to handle that case. This will be
+  // sent when the entry is updated outside of navigation (like when a new
+  // title comes).
+  NOTIFICATION_NAV_ENTRY_CHANGED,
+
+  // Other load-related (not from NavigationController) ----------------------
+
+  // Corresponds to ViewHostMsg_DocumentOnLoadCompletedInMainFrame. The source
+  // is the TabContents and the details the page_id.
+  NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME,
+
+  // A content load is starting.  The source will be a
+  // Source<NavigationController> corresponding to the tab in which the load
+  // is occurring.  No details are expected for this notification.
+  NOTIFICATION_LOAD_START,
+
+  // A content load has stopped. The source will be a
+  // Source<NavigationController> corresponding to the tab in which the load
+  // is occurring.  Details in the form of a LoadNotificationDetails object
+  // are optional.
+  NOTIFICATION_LOAD_STOP,
+
+  // Content was loaded from an in-memory cache.  The source will be a
+  // Source<NavigationController> corresponding to the tab in which the load
+  // occurred.  Details in the form of a LoadFromMemoryCacheDetails object
+  // are provided.
+  NOTIFICATION_LOAD_FROM_MEMORY_CACHE,
+
+  // A provisional content load has failed with an error.  The source will be
+  // a Source<NavigationController> corresponding to the tab in which the
+  // load occurred.  Details in the form of a ProvisionalLoadDetails object
+  // are provided.
+  NOTIFICATION_FAIL_PROVISIONAL_LOAD_WITH_ERROR,
+
+  // A response has been received for a resource request.  The source will be
+  // a Source<RenderViewHostDelegate> corresponding to the tab in which the
+  // request was issued.  Details in the form of a ResourceRequestDetails
+  // object are provided.
+  NOTIFICATION_RESOURCE_RESPONSE_STARTED,
+
+  // A redirect was received while requesting a resource.  The source will be
+  // a Source<RenderViewHostDelegate> corresponding to the tab in which the
+  // request was issued.  Details in the form of a ResourceRedirectDetails
+  // are provided.
+  NOTIFICATION_RESOURCE_RECEIVED_REDIRECT,
+
+  // A new window is created in response to a request from a renderer. The
+  // source will be a Source<TabContents> corresponding to the tab the
+  // request originates from.  Details in the form of a
+  // ViewHostMsg_CreateWindow_Params object are provided.
+  NOTIFICATION_CREATING_NEW_WINDOW,
+
+  // A new window was requested but was not created. The source will be a
+  // Source<TabContents> corresponding to the tab the request originated from.
+  // Details are the ViewHostMsg_CreateWindow_Params object that were used in
+  // the request.
+  NOTIFICATION_CREATING_NEW_WINDOW_CANCELLED,
+
+  // SSL ---------------------------------------------------------------------
+
+  // Updating the SSL security indicators (the lock icon and such) proceeds
+  // in two phases:
+  //
+  // 1) The internal SSL state for a host or tab changes.  When this happens,
+  //    the SSLManager broadcasts an SSL_INTERNAL_STATE_CHANGED notification.
+  //
+  // 2) The SSLManager for each tab receives this notification and might or
+  //    might not update the navigation entry for its tab, depending on
+  //    whether the change in state affects that tab.  If the SSLManager does
+  //    change the navigation entry, then the SSLManager broadcasts an
+  //    SSL_VISIBLE_STATE_CHANGED notification to the user interface can
+  //    redraw properly.
+
+  // The SSL state of a page has changed in some visible way.  For example,
+  // if an insecure resource is loaded on a secure page.  Note that a
+  // toplevel load commit will also update the SSL state (since the
+  // NavigationEntry is new) and this message won't always be sent in that
+  // case.  Listen to this notification if you need to refresh SSL-related UI
+  // elements.
+  //
+  // There is no source or details.
+  NOTIFICATION_SSL_VISIBLE_STATE_CHANGED,
+
+  // The SSL state of the browser has changed in some internal way.  For
+  // example, the user might have explicitly allowed some broken certificate
+  // or a secure origin might have included some insecure content.  Listen to
+  // this notifiation if you need to keep track of our internal SSL state.
+  //
+  // The source will be the navigation controller associated with the state
+  // change.  There are no details.
+  NOTIFICATION_SSL_INTERNAL_STATE_CHANGED,
+
+  // The user accepted or dismissed a SSL client authentication request.
+  // The source is a Source<SSLClientAuthHandler>.  Details is a
+  // SSLClientAuthNotificationDetails which records specifies which
+  // SSLCertRequestInfo the request was for and which X509Certificate was
+  // selected (if any).
+  NOTIFICATION_SSL_CLIENT_AUTH_CERT_SELECTED,
+
+  // Notification that a view was removed from a view hierarchy.  The source
+  // is the view, the details is the parent view.
+  NOTIFICATION_VIEW_REMOVED,
+
+  // This message is sent when the last window considered to be an
+  // "application window" has been closed. Dependent/dialog/utility windows
+  // can use this as a way to know that they should also close. No source or
+  // details are passed.
+  NOTIFICATION_ALL_APPWINDOWS_CLOSED,
 
 #if defined(OS_MACOSX)
-    // This message is sent when the application is made active (Mac OS X only
-    // at present). No source or details are passed.
-    APP_ACTIVATED,
+  // This message is sent when the application is made active (Mac OS X only
+  // at present). No source or details are passed.
+  NOTIFICATION_APP_ACTIVATED,
 #endif
 
-    // This message is sent when the application is terminating (the last
-    // browser window has shutdown as part of an explicit user-initiated exit,
-    // or the user closed the last browser window on Windows/Linux and there are
-    // no BackgroundContents keeping the browser running). No source or details
-    // are passed.
-    APP_TERMINATING,
+  // This message is sent when the application is terminating (the last
+  // browser window has shutdown as part of an explicit user-initiated exit,
+  // or the user closed the last browser window on Windows/Linux and there are
+  // no BackgroundContents keeping the browser running). No source or details
+  // are passed.
+  NOTIFICATION_APP_TERMINATING,
 
 #if defined(OS_MACOSX)
-    // This notification is sent when the app has no key window, such as when
-    // all windows are closed but the app is still active. No source or details
-    // are provided.
-    NO_KEY_WINDOW,
+  // This notification is sent when the app has no key window, such as when
+  // all windows are closed but the app is still active. No source or details
+  // are provided.
+  NOTIFICATION_NO_KEY_WINDOW,
 #endif
 
-    // This is sent when the user has chosen to exit the app, but before any
-    // browsers have closed. This is sent if the user chooses to exit
-    // (via exit menu item or keyboard shortcut) or to restart the process
-    // (such as in flags page), not if Chrome exists by some other means
-    // (such as the user closing the last window). Note that receiving this
-    // notification does not necessarily mean the process will exit
-    // because the shutdown process can be cancelled by unload handler.
-    // Use APP_TERMINATING for such needs.
-    //  The source and details are unspecified.
-    APP_EXITING,
-
-    // Indicates that a top window has been closed.  The source is the HWND
-    // that was closed, no details are expected.
-    WINDOW_CLOSED,
-
-    // Indicates that a devtools window is closing. The source is the Profile*
-    // and the details is the inspected RenderViewHost*.
-    DEVTOOLS_WINDOW_CLOSING,
-
-    // Sent when an info bubble has been created but not yet shown. The source
-    // is the InfoBubble.
-    INFO_BUBBLE_CREATED,
-
-    // Sent when the language (English, French...) for a page has been detected.
-    // The details Details<std::string> contain the ISO 639-1 language code and
-    // the source is Source<TabContents>.
-    TAB_LANGUAGE_DETERMINED,
-
-    // Sent when a page has been translated. The source is the tab for that page
-    // (Source<TabContents>) and the details are the language the page was
-    // originally in and the language it was translated to
-    // (std::pair<std::string, std::string>).
-    PAGE_TRANSLATED,
-
-    // Sent after the renderer returns a snapshot of tab contents.
-    // The source (Source<TabContentsWrapper>) is the RenderViewHost for which
-    // the snapshot was generated and the details (Details<const SkBitmap>) is
-    // the actual snapshot.
-    TAB_SNAPSHOT_TAKEN,
-
-    // The user has changed the browser theme. The source is a
-    // Source<ThemeService>. There are no details.
-    BROWSER_THEME_CHANGED,
-
-    // Sent when the renderer returns focus to the browser, as part of focus
-    // traversal. The source is the browser, there are no details.
-    FOCUS_RETURNED_TO_BROWSER,
-
-    // Application-modal dialogs -----------------------------------------------
-
-    // Sent after an application-modal dialog has been shown. The source
-    // is the dialog.
-    APP_MODAL_DIALOG_SHOWN,
-
-    // Tabs --------------------------------------------------------------------
-
-    // Sent when a tab is added to a TabContentsDelegate. The source is the
-    // TabContentsDelegate and the details is the TabContents.
-    TAB_ADDED,
-
-    // This notification is sent after a tab has been appended to the tab_strip.
-    // The source is a Source<TabContentsWrapper> of the tab being added. There
-    // are no details.
-    TAB_PARENTED,
-
-    // This message is sent before a tab has been closed.  The source is a
-    // Source<NavigationController> with a pointer to the controller for the
-    // closed tab.  No details are expected.
-    //
-    // See also TAB_CLOSED.
-    TAB_CLOSING,
-
-    // Notification that a tab has been closed. The source is the
-    // NavigationController with no details.
-    TAB_CLOSED,
-
-    // This notification is sent when a render view host has connected to a
-    // renderer process. The source is a Source<TabContents> with a pointer to
-    // the TabContents.  A TAB_CONTENTS_DISCONNECTED notification is
-    // guaranteed before the source pointer becomes junk.  No details are
-    // expected.
-    TAB_CONTENTS_CONNECTED,
-
-    // This notification is sent when a TabContents swaps its render view host
-    // with another one, possibly changing processes. The source is a
-    // Source<TabContents> with a pointer to the TabContents.  A
-    // TAB_CONTENTS_DISCONNECTED notification is guaranteed before the
-    // source pointer becomes junk.  No details are expected.
-    TAB_CONTENTS_SWAPPED,
-
-    // This message is sent after a TabContents is disconnected from the
-    // renderer process.  The source is a Source<TabContents> with a pointer to
-    // the TabContents (the pointer is usable).  No details are expected.
-    TAB_CONTENTS_DISCONNECTED,
-
-    // This notification is sent after TabContents' title is updated. The source
-    // is a Source<TabContents> with a pointer to the TabContents. The details
-    // is a Details<TitleUpdatedDetails> that contains more information.
-    TAB_CONTENTS_TITLE_UPDATED,
-
-    // This message is sent when a new InfoBar has been added to a
-    // TabContentsWrapper.  The source is a Source<TabContentsWrapper> with a
-    // pointer to the TabContentsWrapper the InfoBar was added to.  The details
-    // is a Details<InfoBarDelegate> with a pointer to the delegate that was
-    // added.
-    TAB_CONTENTS_INFOBAR_ADDED,
-
-    // This message is sent when an InfoBar is about to be removed from a
-    // TabContentsWrapper.  The source is a Source<TabContentsWrapper> with a
-    // pointer to the TabContentsWrapper the InfoBar was removed from.  The
-    // details is a Details<std::pair<InfoBarDelegate*, bool> > with a pointer
-    // to the removed delegate and whether the removal should be animated.
-    TAB_CONTENTS_INFOBAR_REMOVED,
-
-    // This message is sent when an InfoBar is replacing another infobar in a
-    // TabContentsWrapper.  The source is a Source<TabContentsWrapper> with a
-    // pointer to the TabContentsWrapper the InfoBar was removed from.  The
-    // details is a Details<std::pair<InfoBarDelegate*, InfoBarDelegate*> > with
-    // pointers to the old and new delegates, respectively.
-    TAB_CONTENTS_INFOBAR_REPLACED,
-
-    // This is sent when an externally hosted tab is created. The details
-    // contain the ExternalTabContainer that contains the tab
-    EXTERNAL_TAB_CREATED,
-
-    // This is sent when an externally hosted tab is closed.  No details are
-    // expected.
-    EXTERNAL_TAB_CLOSED,
-
-    // Indicates that the new page tab has finished loading. This is used for
-    // performance testing to see how fast we can load it after startup, and is
-    // only called once for the lifetime of the browser. The source is unused.
-    // Details is an integer: the number of milliseconds elapsed between
-    // starting and finishing all painting.
-    INITIAL_NEW_TAB_UI_LOAD,
-
-    // Used to fire notifications about how long various events took to
-    // complete.  E.g., this is used to get more fine grained timings from the
-    // new tab page.  Details is a MetricEventDurationDetails.
-    METRIC_EVENT_DURATION,
-
-    // This notification is sent when a TabContents is being hidden, e.g. due
-    // to switching away from this tab.  The source is a Source<TabContents>.
-    TAB_CONTENTS_HIDDEN,
-
-    // This notification is sent when a TabContents is being destroyed. Any
-    // object holding a reference to a TabContents can listen to that
-    // notification to properly reset the reference. The source is a
-    // Source<TabContents>.
-    TAB_CONTENTS_DESTROYED,
-
-    // This notification is sent when TabContents::SetAppExtension is invoked.
-    // The source is the ExtensionTabHelper SetAppExtension was invoked on.
-    TAB_CONTENTS_APPLICATION_EXTENSION_CHANGED,
-
-    // A RenderViewHost was created for a TabContents. The source is the
-    // associated TabContents, and the details is the RenderViewHost
-    // pointer.
-    RENDER_VIEW_HOST_CREATED_FOR_TAB,
-
-    // Notification than an interstitial has become associated with a tab. The
-    // source is the TabContents, the details not used.
-    INTERSTITIAL_ATTACHED,
-
-    // Stuff inside the tabs ---------------------------------------------------
-
-    // This message is sent after a constrained window has been closed.  The
-    // source is a Source<ConstrainedWindow> with a pointer to the closed child
-    // window.  (The pointer isn't usable, except for identification.) No
-    // details are expected.
-    CWINDOW_CLOSED,
-
-    // Indicates that a RenderProcessHost was created and its handle is now
-    // available. The source will be the RenderProcessHost that corresponds to
-    // the process.
-    RENDERER_PROCESS_CREATED,
-
-    // Indicates that a RenderProcessHost is destructing. The source will be the
-    // RenderProcessHost that corresponds to the process.
-    RENDERER_PROCESS_TERMINATED,
-
-    // Indicates that a render process is starting to exit, such that it should
-    // not be used for future navigations.  The source will be the
-    // RenderProcessHost that corresponds to the process.
-    RENDERER_PROCESS_CLOSING,
-
-    // Indicates that a render process was closed (meaning it exited, but the
-    // RenderProcessHost might be reused).  The source will be the corresponding
-    // RenderProcessHost.  The details will be a RendererClosedDetails struct.
-    // This may get sent along with RENDERER_PROCESS_TERMINATED.
-    RENDERER_PROCESS_CLOSED,
-
-    // Indicates that a render process has become unresponsive for a period of
-    // time. The source will be the RenderWidgetHost that corresponds to the
-    // hung view, and no details are expected.
-    RENDERER_PROCESS_HANG,
-
-    // This is sent to notify that the RenderViewHost displayed in a
-    // TabContents has changed.  Source is the TabContents for which the change
-    // happened, details is the previous RenderViewHost (can be NULL when the
-    // first RenderViewHost is set).
-    RENDER_VIEW_HOST_CHANGED,
-
-    // Indicates that the render view host has received an accessibility tree
-    // update, either partial or full, from the render view.  The source is the
-    // RenderViewHost, the details are not used.
-    RENDER_VIEW_HOST_ACCESSIBILITY_TREE_UPDATED,
-
-    // This is sent when a RenderWidgetHost is being destroyed. The source is
-    // the RenderWidgetHost, the details are not used.
-    RENDER_WIDGET_HOST_DESTROYED,
-
-    // Sent when the widget is about to paint. The source is the
-    // RenderWidgetHost, the details are not used.
-    RENDER_WIDGET_HOST_WILL_PAINT,
-
-    // Sent after the widget has painted. The source is the RenderWidgetHost,
-    // the details are not used.
-    RENDER_WIDGET_HOST_DID_PAINT,
-
-    // This notifies the observer that a PaintAtSizeACK was received. The source
-    // is the RenderWidgetHost, the details are an instance of
-    // RenderWidgetHost::PaintAtSizeAckDetails.
-    RENDER_WIDGET_HOST_DID_RECEIVE_PAINT_AT_SIZE_ACK,
-
-    // This notifies the observer that a HandleInputEventACK was received. The
-    // source is the RenderWidgetHost, the details are the type of event
-    // received.
-    // Note: The RenderWidgetHost may be deallocated at this point.
-    // Used only in testing.
-    RENDER_WIDGET_HOST_DID_RECEIVE_INPUT_EVENT_ACK,
-
-    // Sent from RenderViewHost constructor. The source is the RenderViewHost,
-    // the details unused.
-    RENDER_VIEW_HOST_CREATED,
-
-    // Sent from ~RenderViewHost. The source is the RenderViewHost, the details
-    // unused.
-    RENDER_VIEW_HOST_DELETED,
-
-    // Sent from RenderViewHost::ClosePage.  The hosted RenderView has
-    // processed the onbeforeunload handler and is about to be sent a
-    // ViewMsg_ClosePage message to complete the tear-down process.  The source
-    // is the RenderViewHost sending the message, and no details are provided.
-    // Note:  This message is not sent in response to RenderView closure
-    // initiated by window.close().
-    RENDER_VIEW_HOST_WILL_CLOSE_RENDER_VIEW,
-
-    // This notifies the observer that the drag operation ack in a drag and
-    // drop operation was received. The source is the RenderViewHost.
-    // Note: Used only in testing.
-    RENDER_VIEW_HOST_DID_RECEIVE_DRAG_TARGET_DROP_ACK,
-
-    // Indicates a RenderWidgetHost has been hidden or restored. The source is
-    // the RWH whose visibility changed, the details is a bool set to true if
-    // the new state is "visible."
-    RENDER_WIDGET_VISIBILITY_CHANGED,
-
-    // Notification from TabContents that we have received a response from the
-    // renderer in response to a dom automation controller action.
-    DOM_OPERATION_RESPONSE,
-
-    // Sent when the bookmark bubble hides. The source is the profile, the
-    // details unused.
-    BOOKMARK_BUBBLE_HIDDEN,
-
-    // This notification is sent when the result of a find-in-page search is
-    // available with the browser process. The source is a Source<TabContents>
-    // with a pointer to the TabContents. Details encompass a
-    // FindNotificationDetail object that tells whether the match was found or
-    // not found.
-    FIND_RESULT_AVAILABLE,
-
-    // This is sent when the users preference for when the bookmark bar should
-    // be shown changes. The source is the profile, and the details are
-    // NoDetails.
-    BOOKMARK_BAR_VISIBILITY_PREF_CHANGED,
-
-    // Sent just before the installation confirm dialog is shown. The source
-    // is the ExtensionInstallUI, the details are NoDetails.
-    EXTENSION_WILL_SHOW_CONFIRM_DIALOG,
-
-    // Used to monitor web cache usage by notifying whenever the
-    // CacheManagerHost observes new UsageStats. The source will be the
-    // RenderProcessHost that corresponds to the new statistics. Details are a
-    // UsageStats object sent by the renderer, and should be copied - ptr not
-    // guaranteed to be valid after the notification.
-    WEB_CACHE_STATS_OBSERVED,
-
-    // The focused element inside a page has changed.  The source is the
-    // TabContents containing the render view host for the page. The details is
-    // a Details<const bool> that indicates whether or not an editable node was
-    // focused.
-    FOCUS_CHANGED_IN_PAGE,
-
-    // Notification posted from ExecuteJavascriptInWebFrameNotifyResult. The
-    // source is the RenderViewHost ExecuteJavascriptInWebFrameNotifyResult was
-    // invoked on. The details are a std::pair<int, Value*> with the int giving
-    // the id returned from ExecuteJavascriptInWebFrameNotifyResult and the
-    // Value the results of the javascript expression. The Value is owned by
-    // RenderViewHost and may be a Null Value.
-    EXECUTE_JAVASCRIPT_RESULT,
-
-    // BackgroundContents ------------------------------------------------------
-
-    // A new background contents was opened by script. The source is the parent
-    // profile and the details are BackgroundContentsOpenedDetails.
-    BACKGROUND_CONTENTS_OPENED,
-
-    // The background contents navigated to a new location. The source is the
-    // parent Profile, and the details are the BackgroundContents that was
-    // navigated.
-    BACKGROUND_CONTENTS_NAVIGATED,
-
-    // The background contents were closed by someone invoking window.close()
-    // or the parent application was uninstalled.
-    // The source is the parent profile, and the details are the
-    // BackgroundContents.
-    BACKGROUND_CONTENTS_CLOSED,
-
-    // The background contents is being deleted. The source is the
-    // parent Profile, and the details are the BackgroundContents being deleted.
-    BACKGROUND_CONTENTS_DELETED,
-
-    // The background contents has crashed. The source is the parent Profile,
-    // and the details are the BackgroundContents.
-    BACKGROUND_CONTENTS_TERMINATED,
-
-    // Child Processes ---------------------------------------------------------
-
-    // This notification is sent when a child process host has connected to a
-    // child process.  There is no usable source, since it is sent from an
-    // ephemeral task; register for AllSources() to receive this notification.
-    // The details are in a Details<ChildProcessInfo>.
-    CHILD_PROCESS_HOST_CONNECTED,
-
-    // This message is sent after a ChildProcessHost is disconnected from the
-    // child process.  There is no usable source, since it is sent from an
-    // ephemeral task; register for AllSources() to receive this notification.
-    // The details are in a Details<ChildProcessInfo>.
-    CHILD_PROCESS_HOST_DISCONNECTED,
-
-    // This message is sent when a child process disappears
-    // unexpectedly as a result of a crash.  There is no usable
-    // source, since it is sent from an ephemeral task; register for
-    // AllSources() to receive this notification.  The details are in
-    // a Details<ChildProcessInfo>.
-    CHILD_PROCESS_CRASHED,
-
-    // This message is sent when a child process disappears
-    // unexpectedly as a result of a termination signal.  There is no
-    // usable source, since it is sent from an ephemeral task;
-    // register for AllSources() to receive this notification.  The
-    // details are in a Details<ChildProcessInfo>.
-    CHILD_PROCESS_WAS_KILLED,
-
-    // This message indicates that an instance of a particular child was
-    // created in a page.  (If one page contains several regions rendered by
-    // the same child, this notification will occur once for each region
-    // during the page load.)
-    //
-    // There is no usable source, since it is sent from an ephemeral task;
-    // register for AllSources() to receive this notification.  The details are
-    // in a Details<ChildProcessInfo>.
-    CHILD_INSTANCE_CREATED,
-
-    // This is sent when network interception is disabled for a plugin, or the
-    // plugin is unloaded.  This should only be sent/received on the browser IO
-    // thread or the plugin thread. The source is the plugin that is disabling
-    // interception.  No details are expected.
-    CHROME_PLUGIN_UNLOADED,
-
-    // Sent by the PluginUpdater when there is a change of plugin
-    // enable/disable status.
-    PLUGIN_ENABLE_STATUS_CHANGED,
-
-    // This is sent when a login prompt is shown.  The source is the
-    // Source<NavigationController> for the tab in which the prompt is shown.
-    // Details are a LoginNotificationDetails which provide the LoginHandler
-    // that should be given authentication.
-    AUTH_NEEDED,
-
-    // This is sent when authentication credentials have been supplied (either
-    // by the user or by an automation service), but before we've actually
-    // received another response from the server.  The source is the
-    // Source<NavigationController> for the tab in which the prompt was shown.
-    // Details are an AuthSuppliedLoginNotificationDetails which provide the
-    // LoginHandler that should be given authentication as well as the supplied
-    // username and password.
-    AUTH_SUPPLIED,
-
-    // This is sent when an authentication request has been dismissed without
-    // supplying credentials (either by the user or by an automation service).
-    // The source is the Source<NavigationController> for the tab in which the
-    // prompt was shown. Details are a LoginNotificationDetails which provide
-    // the LoginHandler that should be cancelled.
-    AUTH_CANCELLED,
-
-    // Saved Pages -------------------------------------------------------------
-
-    // Sent when a SavePackage finishes successfully. The source is the
-    // SavePackage, and Details are a GURL containing address of downloaded
-    // page.
-    SAVE_PACKAGE_SUCCESSFULLY_FINISHED,
-
-    // History -----------------------------------------------------------------
-
-    // Sent when a history service is created on the main thread. This is sent
-    // after history is created, but before it has finished loading. Use
-    // HISTORY_LOADED is you need to know when loading has completed.
-    // The source is the profile that the history service belongs to, and the
-    // details is the pointer to the newly created HistoryService object.
-    HISTORY_CREATED,
-
-    // Sent when a history service has finished loading. The source is the
-    // profile that the history service belongs to, and the details is the
-    // HistoryService.
-    HISTORY_LOADED,
-
-    // Sent when a URL that has been typed has been added or modified. This is
-    // used by the in-memory URL database (used by autocomplete) to track
-    // changes to the main history system.
-    //
-    // The source is the profile owning the history service that changed, and
-    // the details is history::URLsModifiedDetails that lists the modified or
-    // added URLs.
-    HISTORY_TYPED_URLS_MODIFIED,
-
-    // Sent when the user visits a URL.
-    //
-    // The source is the profile owning the history service that changed, and
-    // the details is history::URLVisitedDetails.
-    HISTORY_URL_VISITED,
-
-    // Sent when one or more URLs are deleted.
-    //
-    // The source is the profile owning the history service that changed, and
-    // the details is history::URLsDeletedDetails that lists the deleted URLs.
-    HISTORY_URLS_DELETED,
-
-    // Sent when a keyword search term is updated. The source is the Profile and
-    // the details are history::KeywordSearchTermDetails
-    HISTORY_KEYWORD_SEARCH_TERM_UPDATED,
-
-    // Sent by history when the favicon of a URL changes.  The source is the
-    // profile, and the details is history::FaviconChangeDetails (see
-    // history_notifications.h).
-    FAVICON_CHANGED,
-
-    // Sent by FaviconTabHelper when a tab's favicon has been successfully
-    // updated.
-    FAVICON_UPDATED,
-
-    // Sent after an incognito profile has been created. The details are none
-    // and the source is the new profile.
-    OTR_PROFILE_CREATED,
-
-    // Sent before a Profile is destroyed. The details are
-    // none and the source is a Profile*.
-    PROFILE_DESTROYED,
-
-    // TopSites ----------------------------------------------------------------
-
-    // Sent by TopSites when it finishes loading. The source is the profile the
-    // details the TopSites.
-    TOP_SITES_LOADED,
-
-    // Sent by TopSites when it has finished updating its most visited URLs
-    // cache after querying the history service. The source is the TopSites and
-    // the details a CancelableRequestProvider::Handle from the history service
-    // query.
-    // Used only in testing.
-    TOP_SITES_UPDATED,
-
-    // Sent by TopSites when the either one of the most visited urls changed, or
-    // one of the images changes. The source is the TopSites, the details not
-    // used.
-    TOP_SITES_CHANGED,
-
-    // Thumbnails---------------------------------------------------------------
-
-    // Sent by the ThumbnailGenerator whenever a render widget host
-    // updates its backing store.  The source is the
-    // ThumbnailGenerator, and the details are the RenderWidgetHost
-    // that notified the ThumbnailGenerator that its backing store was
-    // updated.
-    THUMBNAIL_GENERATOR_SNAPSHOT_CHANGED,
-
-    // Bookmarks ---------------------------------------------------------------
-
-    // Sent when the starred state of a URL changes. A URL is starred if there
-    // is at least one bookmark for it. The source is a Profile and the details
-    // is history::URLsStarredDetails that contains the list of URLs and
-    // whether they were starred or unstarred.
-    URLS_STARRED,
-
-    // Sent when the bookmark bar model finishes loading. This source is the
-    // Profile, and the details aren't used.
-    BOOKMARK_MODEL_LOADED,
-
-    // Sent when the bookmark bubble is shown for a particular URL. The source
-    // is the profile, the details the URL.
-    BOOKMARK_BUBBLE_SHOWN,
-
-    // Non-history storage services --------------------------------------------
-
-    // Notification that the TemplateURLService has finished loading from the
-    // database. The source is the TemplateURLService, and the details are
-    // NoDetails.
-    TEMPLATE_URL_SERVICE_LOADED,
-
-    // Sent when a TemplateURL is removed from the model. The source is the
-    // Profile, and the details the id of the TemplateURL being removed.
-    TEMPLATE_URL_REMOVED,
-
-    // Notification triggered when a web application has been installed or
-    // uninstalled. Any application view should reload its data.  The source is
-    // the profile. No details are provided.
-    WEB_APP_INSTALL_CHANGED,
-
-    // This is sent to a pref observer when a pref is changed. The source is the
-    // PrefService and the details a std::string of the changed path.
-    PREF_CHANGED,
-
-    // This is broadcast after the preference subsystem has completed
-    // asynchronous initalization of a PrefService.
-    PREF_INITIALIZATION_COMPLETED,
-
-    // Sent when a default request context has been created, so calling
-    // Profile::GetDefaultRequestContext() will not return NULL.  This is sent
-    // on the thread where Profile::GetRequestContext() is first called, which
-    // should be the UI thread.
-    DEFAULT_REQUEST_CONTEXT_AVAILABLE,
-
-    // The state of a web resource has been changed. A resource may have been
-    // added, removed, or altered. Source is WebResourceService, and the
-    // details are NoDetails.
-    PROMO_RESOURCE_STATE_CHANGED,
-
-    // Autocomplete ------------------------------------------------------------
-
-    // Sent by the autocomplete controller when done.  The source is the
-    // AutocompleteController, the details not used.
-    AUTOCOMPLETE_CONTROLLER_RESULT_READY,
-
-    // This is sent when an item of the Omnibox popup is selected. The source
-    // is the profile.
-    OMNIBOX_OPENED_URL,
-
-    // Sent by the omnibox when it is destroyed.
-    OMNIBOX_DESTROYED,
-
-    // Sent by the omnibox when it is focused.
-    OMNIBOX_FOCUSED,
-
-    // Sent when the main Google URL has been updated.  Some services cache
-    // this value and need to update themselves when it changes.  See
-    // google_util::GetGoogleURLAndUpdateIfNecessary().
-    GOOGLE_URL_UPDATED,
-
-    // Printing ----------------------------------------------------------------
-
-    // Notification from PrintJob that an event occurred. It can be that a page
-    // finished printing or that the print job failed. Details is
-    // PrintJob::EventDetails. Source is a PrintJob.
-    PRINT_JOB_EVENT,
-
-    // Sent when a PrintJob has been released.
-    // Source is the TabContentsWrapper that holds the print job.
-    PRINT_JOB_RELEASED,
-
-    // Shutdown ----------------------------------------------------------------
-
-    // Sent on the browser IO thread when an net::URLRequestContext is released
-    // by its owning Profile.  The source is a pointer to the
-    // net::URLRequestContext.
-    URL_REQUEST_CONTEXT_RELEASED,
-
-    // Sent when WM_ENDSESSION has been received, after the browsers have been
-    // closed but before browser process has been shutdown. The source/details
-    // are all source and no details.
-    SESSION_END,
-
-    // User Scripts ------------------------------------------------------------
-
-    // Sent when there are new user scripts available.  The details are a
-    // pointer to SharedMemory containing the new scripts.
-    USER_SCRIPTS_UPDATED,
-
-    // User Style Sheet --------------------------------------------------------
-
-    // Sent when the user style sheet has changed.
-    USER_STYLE_SHEET_UPDATED,
-
-    // Extensions --------------------------------------------------------------
-
-    // Sent when a CrxInstaller finishes. Source is the CrxInstaller that
-    // finished.  No details.
-    CRX_INSTALLER_DONE,
-
-    // Sent when the known installed extensions have all been loaded.  In
-    // testing scenarios this can happen multiple times if extensions are
-    // unloaded and reloaded. The source is a Profile.
-    EXTENSIONS_READY,
-
-    // Sent when a new extension is loaded. The details are an Extension, and
-    // the source is a Profile.
-    EXTENSION_LOADED,
-
-    // Sent when attempting to load a new extension, but they are disabled. The
-    // details are an Extension*, and the source is a Profile*.
-    EXTENSION_UPDATE_DISABLED,
-
-    // Sent when an extension is about to be installed so we can (in the case of
-    // themes) alert the user with a loading dialog. The source is the download
-    // manager and the details are the download url.
-    EXTENSION_READY_FOR_INSTALL,
-
-    // Sent when an extension install turns out to not be a theme.
-    NO_THEME_DETECTED,
-
-    // Sent when new extensions are installed. The details are an Extension, and
-    // the source is a Profile.
-    EXTENSION_INSTALLED,
-
-    // An error occured during extension install. The details are a string with
-    // details about why the install failed.
-    EXTENSION_INSTALL_ERROR,
-
-    // Sent when an extension install is not allowed, as indicated by
-    // PendingExtensionInfo::ShouldAllowInstall. The details are an Extension,
-    // and the source is a Profile.
-    EXTENSION_INSTALL_NOT_ALLOWED,
-
-    // Sent when an extension has been uninstalled.  The details are
-    // an UninstalledExtensionInfo struct and the source is a Profile.
-    EXTENSION_UNINSTALLED,
-
-    // Sent when an extension uninstall is not allowed because the extension is
-    // not user manageable.  The details are an Extension, and the source is a
-    // Profile.
-    EXTENSION_UNINSTALL_NOT_ALLOWED,
-
-    // Sent when an extension is unloaded. This happens when an extension is
-    // uninstalled or disabled. The details are an UnloadedExtensionInfo, and
-    // the source is a Profile.
-    //
-    // Note that when this notification is sent, ExtensionService has already
-    // removed the extension from its internal state.
-    EXTENSION_UNLOADED,
-
-    // Sent after a new ExtensionHost is created. The details are
-    // an ExtensionHost* and the source is an ExtensionProcessManager*.
-    EXTENSION_HOST_CREATED,
-
-    // Sent before an ExtensionHost is destroyed. The details are
-    // an ExtensionHost* and the source is a Profile*.
-    EXTENSION_HOST_DESTROYED,
-
-    // Sent by an ExtensionHost when it finished its initial page load.
-    // The details are an ExtensionHost* and the source is a Profile*.
-    EXTENSION_HOST_DID_STOP_LOADING,
-
-    // Sent by an ExtensionHost when its render view requests closing through
-    // window.close(). The details are an ExtensionHost* and the source is a
-    // Profile*.
-    EXTENSION_HOST_VIEW_SHOULD_CLOSE,
-
-    // Sent after an extension render process is created and fully functional.
-    // The details are an ExtensionHost*.
-    EXTENSION_PROCESS_CREATED,
-
-    // Sent when extension render process ends (whether it crashes or closes).
-    // The details are an ExtensionHost* and the source is a Profile*. Not sent
-    // during browser shutdown.
-    EXTENSION_PROCESS_TERMINATED,
-
-    // Sent when a background page is ready so other components can load.
-    EXTENSION_BACKGROUND_PAGE_READY,
-
-    // Sent when a pop-up extension view is ready, so that notification may
-    // be sent to pending callbacks.  Note that this notification is sent
-    // after all onload callbacks have been invoked in the main frame.
-    // The details is the ExtensionHost* hosted within the popup, and the source
-    // is a Profile*.
-    EXTENSION_POPUP_VIEW_READY,
-
-    // Sent when a browser action's state has changed. The source is the
-    // ExtensionAction* that changed.  There are no details.
-    EXTENSION_BROWSER_ACTION_UPDATED,
-
-    // Sent when the count of page actions has changed. Note that some of them
-    // may not apply to the current page. The source is a LocationBar*. There
-    // are no details.
-    EXTENSION_PAGE_ACTION_COUNT_CHANGED,
-
-    // Sent when a browser action's visibility has changed. The source is the
-    // ExtensionPrefs* that changed. The details are a Extension*.
-    EXTENSION_BROWSER_ACTION_VISIBILITY_CHANGED,
-
-    // Sent when a page action's visibility has changed. The source is the
-    // ExtensionAction* that changed. The details are a TabContents*.
-    EXTENSION_PAGE_ACTION_VISIBILITY_CHANGED,
-
-    // Sent by an extension to notify the browser about the results of a unit
-    // test.
-    EXTENSION_TEST_PASSED,
-    EXTENSION_TEST_FAILED,
-
-    // Sent by extension test javascript code, typically in a browser test. The
-    // sender is a std::string representing the extension id, and the details
-    // are a std::string with some message. This is particularly useful when you
-    // want to have C++ code wait for javascript code to do something.
-    EXTENSION_TEST_MESSAGE,
-
-    // Sent when an bookmarks extensions API function was successfully invoked.
-    // The source is the id of the extension that invoked the function, and the
-    // details are a pointer to the const BookmarksFunction in question.
-    EXTENSION_BOOKMARKS_API_INVOKED,
-
-    // Sent when an omnibox extension has sent back omnibox suggestions. The
-    // source is the profile, and the details are an ExtensionOmniboxSuggestions
-    // object.
-    EXTENSION_OMNIBOX_SUGGESTIONS_READY,
-
-    // Sent when the user accepts the input in an extension omnibox keyword
-    // session. The source is the profile.
-    EXTENSION_OMNIBOX_INPUT_ENTERED,
-
-    // Sent when an omnibox extension has updated the default suggestion. The
-    // source is the profile.
-    EXTENSION_OMNIBOX_DEFAULT_SUGGESTION_CHANGED,
-
-    // Sent when an extension changes a preference value. The source is the
-    // profile, and the details are an ExtensionPrefStore::ExtensionPrefDetails
-    // object.
-    EXTENSION_PREF_CHANGED,
-
-    // Sent when the extension updater starts checking for updates to installed
-    // extensions. The source is a Profile, and there are no details.
-    EXTENSION_UPDATING_STARTED,
-
-    // Sent when the extension updater is finished checking for updates to
-    // installed extensions. The source is a Profile, and there are no details.
-    // NOTE: It's possible that there are extension updates still being
-    // installed by the extension service at the time this notification fires.
-    EXTENSION_UPDATING_FINISHED,
-
-    // The extension updater found an update and will attempt to download and
-    // install it. The source is a Profile, and the details are an extension id
-    // (const std::string).
-    EXTENSION_UPDATE_FOUND,
-
-    // An installed app changed notification state (added or removed
-    // notifications). The source is a Profile, and the details are a string
-    // with the extension id of the app.
-    APP_NOTIFICATION_STATE_CHANGED,
-
-    // Desktop Notifications ---------------------------------------------------
-
-    // This notification is sent when a balloon is connected to a renderer
-    // process to render the balloon contents.  The source is a
-    // Source<BalloonHost> with a pointer to the the balloon.  A
-    // NOTIFY_BALLOON_DISCONNECTED is guaranteed before the source pointer
-    // becomes junk. No details expected.
-    NOTIFY_BALLOON_CONNECTED,
-
-    // This message is sent after a balloon is disconnected from the renderer
-    // process. The source is a Source<BalloonHost> with a pointer to the
-    // balloon host (the pointer is usable). No details are expected.
-    NOTIFY_BALLOON_DISCONNECTED,
-
-    // Web Database Service ----------------------------------------------------
-
-    // This notification is sent whenever autofill entries are
-    // changed.  The detail of this notification is a list of changes
-    // represented by a vector of AutofillChange.  Each change
-    // includes a change type (add, update, or remove) as well as the
-    // key of the entry that was affected.
-    AUTOFILL_ENTRIES_CHANGED,
-
-    // Sent when an AutofillProfile has been added/removed/updated in the
-    // WebDatabase.  The detail is an AutofillProfileChange.
-    AUTOFILL_PROFILE_CHANGED,
-
-    // Sent when an Autofill CreditCard has been added/removed/updated in the
-    // WebDatabase.  The detail is an AutofillCreditCardChange.
-    AUTOFILL_CREDIT_CARD_CHANGED,
-
-    // This notification is sent whenever the web database service has finished
-    // loading the web database.  No details are expected.
-    WEB_DATABASE_LOADED,
-
-    // Purge Memory ------------------------------------------------------------
-
-    // Sent on the IO thread when the system should try to reduce the amount of
-    // memory in use, no source or details are passed. See memory_purger.h .cc.
-    PURGE_MEMORY,
-
-    // Upgrade notifications ---------------------------------------------------
-
-    // Sent when Chrome detects that it has been upgraded behind the scenes.
-    // NOTE: The detection mechanism is asynchronous, so this event may arrive
-    // quite some time after the upgrade actually happened. No details are
-    // expected.
-    UPGRADE_DETECTED,
-
-    // Sent when Chrome believes an update has been installed and available for
-    // long enough with the user shutting down to let it take effect. See
-    // upgrade_detector.cc for details on how long it waits. No details are
-    // expected.
-    UPGRADE_RECOMMENDED,
-
-    // Software incompatibility notifications ----------------------------------
-
-    // Sent when Chrome has finished compiling the list of loaded modules (and
-    // other modules of interest). No details are expected.
-    MODULE_LIST_ENUMERATED,
-
-    // Sent when Chrome is done scanning the module list and when the user has
-    // acknowledged the module incompatibility. No details are expected.
-    MODULE_INCOMPATIBILITY_BADGE_CHANGE,
-
-    // Accessibility Notifications ---------------------------------------------
-
-    // Notification that a window in the browser UI (not the web content)
-    // was opened, for propagating to an accessibility extension.
-    // Details will be an AccessibilityWindowInfo.
-    ACCESSIBILITY_WINDOW_OPENED,
-
-    // Notification that a window in the browser UI was closed.
-    // Details will be an AccessibilityWindowInfo.
-    ACCESSIBILITY_WINDOW_CLOSED,
-
-    // Notification that a control in the browser UI was focused.
-    // Details will be an AccessibilityControlInfo.
-    ACCESSIBILITY_CONTROL_FOCUSED,
-
-    // Notification that a control in the browser UI had its action taken,
-    // like pressing a button or toggling a checkbox.
-    // Details will be an AccessibilityControlInfo.
-    ACCESSIBILITY_CONTROL_ACTION,
-
-    // Notification that text box in the browser UI had text change.
-    // Details will be an AccessibilityControlInfo.
-    ACCESSIBILITY_TEXT_CHANGED,
-
-    // Notification that a pop-down menu was opened, for propagating
-    // to an accessibility extension.
-    // Details will be an AccessibilityMenuInfo.
-    ACCESSIBILITY_MENU_OPENED,
-
-    // Notification that a pop-down menu was closed, for propagating
-    // to an accessibility extension.
-    // Details will be an AccessibilityMenuInfo.
-    ACCESSIBILITY_MENU_CLOSED,
-
-    // Content Settings --------------------------------------------------------
-
-    // Sent when content settings change. The source is a HostContentSettings
-    // object, the details are ContentSettingsNotificationsDetails.
-    CONTENT_SETTINGS_CHANGED,
-
-    // Sent when the collect cookies dialog is shown. The source is a
-    // TabSpecificContentSettings object, there are no details.
-    COLLECTED_COOKIES_SHOWN,
-
-    // Sent when the default setting for desktop notifications has changed.
-    // The source is the DesktopNotificationService, the details are None.
-    DESKTOP_NOTIFICATION_DEFAULT_CHANGED,
-
-    // Sent when a non-default setting in the the notification content settings
-    // map has changed. The source is the DesktopNotificationService, the
-    // details are None.
-    DESKTOP_NOTIFICATION_SETTINGS_CHANGED,
-
-    // Sent when the geolocation settings change. The source is the
-    // GeolocationContentSettingsMap object, the details are
-    // ContentSettingsNotificationsDetails.
-    GEOLOCATION_SETTINGS_CHANGED,
-
-    // Sent when content settings change for a tab. The source is a TabContents
-    // object, the details are None.
-    TAB_CONTENT_SETTINGS_CHANGED,
-
-    // Sync --------------------------------------------------------------------
-
-    // Sent when the syncer is blocked configuring.
-    SYNC_CONFIGURE_BLOCKED,
-
-    // The sync service has started the configuration process.
-    SYNC_CONFIGURE_START,
-
-    // The sync service is finished the configuration process.
-    SYNC_CONFIGURE_DONE,
-
-    // The session service has been saved.  This notification type is only sent
-    // if there were new SessionService commands to save, and not for no-op save
-    // operations.
-    SESSION_SERVICE_SAVED,
-
-    // A foreign session has been updated.  If a new tab page is open, the
-    // foreign session handler needs to update the new tab page's foreign
-    // session data.
-    FOREIGN_SESSION_UPDATED,
-
-    // Foreign sessions has been disabled. New tabs should not display foreign
-    // session data.
-    FOREIGN_SESSION_DISABLED,
-
-    // Cookies -----------------------------------------------------------------
-
-    // Sent when a cookie changes. The source is a Profile object, the details
-    // are a ChromeCookieDetails object.
-    COOKIE_CHANGED,
-
-    // Sidebar -----------------------------------------------------------------
-
-    // Sent when the sidebar state is changed.
-    // The source is a SidebarManager instance, the details are the changed
-    // SidebarContainer object.
-    SIDEBAR_CHANGED,
-
-    // Token Service -----------------------------------------------------------
-
-    // When the token service has a new token available for a service, one of
-    // these notifications is issued per new token.
-    // The source is a TokenService on the Profile. The details are a
-    // TokenAvailableDetails object.
-    TOKEN_AVAILABLE,
-
-    // When there aren't any additional tokens left to load, this notification
-    // is sent.
-    // The source is a TokenService on the profile. There are no details.
-    TOKEN_LOADING_FINISHED,
-
-    // If a token request failed, one of these is issued per failed request.
-    // The source is a TokenService on the Profile. The details are a
-    // TokenRequestFailedDetails object.
-    TOKEN_REQUEST_FAILED,
-
-    // When a service has a new token they got from a frontend that the
-    // TokenService should know about, fire this notification. The details
-    // are a TokenAvailableDetails object.
-    TOKEN_UPDATED,
-
-    // Sent when a user signs into Google services such as sync.
-    // The source is the Profile. The details are a GoogleServiceSignin object.
-    GOOGLE_SIGNIN_SUCCESSFUL,
-
-    // Sent when a user fails to sign into Google services such as sync.
-    // The source is the Profile. The details are a GoogleServiceAuthError
-    // object.
-    GOOGLE_SIGNIN_FAILED,
-
-    // Autofill Notifications --------------------------------------------------
-
-    // Sent when a popup with Autofill suggestions is shown in the renderer.
-    // The source is the corresponding RenderViewHost. There are not details.
-    AUTOFILL_DID_SHOW_SUGGESTIONS,
-
-    // Sent when a form is previewed or filled with Autofill suggestions.
-    // The source is the corresponding RenderViewHost. There are not details.
-    AUTOFILL_DID_FILL_FORM_DATA,
-
-    // Download Notifications --------------------------------------------------
-
-    // Sent when a download is initiated. It is possible that the download will
-    // not actually begin due to the DownloadRequestLimiter cancelling it
-    // prematurely.
-    // The source is the corresponding RenderViewHost. There are no details.
-    DOWNLOAD_INITIATED,
-
-    // Sent when a page generation to MHTML has finished.
-    // The source is the corresponding RenderViewHost. The details is a
-    // MHTMLGenerationManager::NotificationDetails.
-    MHTML_GENERATED,
-
-    // Misc --------------------------------------------------------------------
-
-#if defined(OS_CHROMEOS)
-    // Sent when a chromium os user logs in.
-    LOGIN_USER_CHANGED,
-
-    // Sent when user image is updated.
-    LOGIN_USER_IMAGE_CHANGED,
-
-    // Sent when a chromium os user attempts to log in.  The source is
-    // all and the details are AuthenticationNotificationDetails.
-    LOGIN_AUTHENTICATION,
-
-    // Sent when a panel state changed.
-    PANEL_STATE_CHANGED,
-
-    // Sent when the window manager's layout mode has changed.
-    LAYOUT_MODE_CHANGED,
-
-    // Sent when the wizard's content view is destroyed. The source and details
-    // are not used.
-    WIZARD_CONTENT_VIEW_DESTROYED,
-
-    // Sent when the screen lock state has changed. The source is
-    // ScreenLocker and the details is a bool specifing that the
-    // screen is locked. When details is a false, the source object
-    // is being deleted, so the receiver shouldn't use the screen locker
-    // object.
-    SCREEN_LOCK_STATE_CHANGED,
-
-    // Sent when the network state has changed on UI thread.
-    // The source is AllSources and the details is NetworkStateDetails defined
-    // in chrome/browser/chromeos/network_state_notifier.h.
-    // TODO(oshima): Port this to all platforms.
-    NETWORK_STATE_CHANGED,
-
-    // Sent when an attempt to acquire the public key of the owner of a chromium
-    // os device has succeeded.
-    OWNER_KEY_FETCH_ATTEMPT_SUCCEEDED,
-
-    // Sent when an attempt to acquire the public key of the owner of a chromium
-    // os device has failed.
-    OWNER_KEY_FETCH_ATTEMPT_FAILED,
-
-    // Sent after UserManager checked ownership status of logged in user.
-    OWNERSHIP_CHECKED,
-
-    // This is sent to a ChromeOS settings observer when a system setting is
-    // changed. The source is the CrosSettings and the details a std::string of
-    // the changed setting.
-    SYSTEM_SETTING_CHANGED,
-
-    // Sent by SIM unlock dialog when it has finished with the process of
-    // updating RequirePin setting. RequirePin setting might have been changed
-    // to a new value or update might have been canceled.
-    // In either case notification is sent and details contain a bool
-    // that represents current value.
-    REQUIRE_PIN_SETTING_CHANGE_ENDED,
-
-    // Sent by SIM unlock dialog when it has finished the EnterPin or
-    // EnterPuk dialog, either because the user cancelled, or entered a
-    // PIN or PUK.
-    ENTER_PIN_ENDED,
-
-#endif
-
-    // Sent before the repost form warning is brought up.
-    // The source is a NavigationController.
-    REPOST_WARNING_SHOWN,
-
-#if defined(TOOLKIT_VIEWS)
-    // Sent when a bookmark's context menu is shown. Used to notify
-    // tests that the context menu has been created and shown.
-    BOOKMARK_CONTEXT_MENU_SHOWN,
-#endif
-
-    // Sent when the zoom level changes. The source is the HostZoomMap.  The
-    // details is a string of the hostname for which the zoom changed.  In case
-    // of a temporary zoom level change, the details is an empty string.
-    ZOOM_LEVEL_CHANGED,
-
-    // Sent when the tab's closeable state has changed due to increase/decrease
-    // in number of tabs in browser or increase/decrease in number of browsers.
-    // Details<bool> contain the closeable flag while source is AllSources.
-    // This is only sent from ChromeOS's TabCloseableStateWatcher.
-    TAB_CLOSEABLE_STATE_CHANGED,
-
-    // Sent each time the InstantController is updated.
-    INSTANT_CONTROLLER_UPDATED,
-
-    // Sent each time the InstantController shows the InstantLoader.
-    INSTANT_CONTROLLER_SHOWN,
-
-    // Sent when the instant loader determines whether the page supports the
-    // instant API or not. The details is a boolean indicating if the page
-    // supports instant. The source is not used.
-    INSTANT_SUPPORT_DETERMINED,
-
-    // Password Store ----------------------------------------------------------
-    // This notification is sent whenenever login entries stored in the password
-    // store are changed. The detail of this notification is a list of changes
-    // represented by a vector of PasswordStoreChange. Each change includes a
-    // change type (ADD, UPDATE, or REMOVE) as well as the
-    // |webkit_glue::PasswordForm|s that were affected.
-    LOGINS_CHANGED,
-
-    // Sent when the applications in the NTP app launcher have been reordered.
-    EXTENSION_LAUNCHER_REORDERED,
-
-#if defined(OS_CHROMEOS)
-    // Sent when WebSocketProxy started accepting connections.
-    WEB_SOCKET_PROXY_STARTED,
-#endif
-
-    // Sent when a new web store promo has been loaded.
-    WEB_STORE_PROMO_LOADED,
-
-#if defined(TOUCH_UI)
-    // Sent when an API for hiding the keyboard is invoked from JavaScript code.
-    HIDE_KEYBOARD_INVOKED,
-
-    // Sent when an API for set height of the keyboard is invoked from
-    // JavaScript code.
-    SET_KEYBOARD_HEIGHT_INVOKED,
-
-    // Sent when an editable element is touched, such as text box, password
-    // field, and omnibox.
-    EDITABLE_ELEMENT_TOUCHED,
-#endif
-
-    // Protocol Handler Registry -----------------------------------------------
-    // Sent when a ProtocolHandlerRegistry is changed.
-    PROTOCOL_HANDLER_REGISTRY_CHANGED,
-
-    // Sent when the cached profile info has changed.
-    PROFILE_CACHED_INFO_CHANGED,
-
-    // Count (must be last) ----------------------------------------------------
-    // Used to determine the number of notification types.  Not valid as
-    // a type parameter when registering for or posting notifications.
-    NOTIFICATION_TYPE_COUNT
-  };
-
-  // TODO(erg): Our notification system relies on implicit conversion.
-  NotificationType(Type v) : value(v) {}  // NOLINT
-
-  bool operator==(NotificationType t) const { return value == t.value; }
-  bool operator!=(NotificationType t) const { return value != t.value; }
-
-  // Comparison to explicit enum values.
-  bool operator==(Type v) const { return value == v; }
-  bool operator!=(Type v) const { return value != v; }
-
-  Type value;
+  // This is sent when the user has chosen to exit the app, but before any
+  // browsers have closed. This is sent if the user chooses to exit
+  // (via exit menu item or keyboard shortcut) or to restart the process
+  // (such as in flags page), not if Chrome exists by some other means
+  // (such as the user closing the last window). Note that receiving this
+  // notification does not necessarily mean the process will exit
+  // because the shutdown process can be cancelled by unload handler.
+  // Use APP_TERMINATING for such needs.
+  //  The source and details are unspecified.
+  NOTIFICATION_APP_EXITING,
+
+  // Indicates that a devtools window is closing. The source is the Profile*
+  // and the details is the inspected RenderViewHost*.
+  NOTIFICATION_DEVTOOLS_WINDOW_CLOSING,
+
+  // Tabs --------------------------------------------------------------------
+
+  // Sent when a tab is added to a TabContentsDelegate. The source is the
+  // TabContentsDelegate and the details is the TabContents.
+  NOTIFICATION_TAB_ADDED,
+
+  // This notification is sent after a tab has been appended to the tab_strip.
+  // The source is a Source<TabContentsWrapper> of the tab being added. There
+  // are no details.
+  NOTIFICATION_TAB_PARENTED,
+
+  // This message is sent before a tab has been closed.  The source is a
+  // Source<NavigationController> with a pointer to the controller for the
+  // closed tab.  No details are expected.
+  //
+  // See also TAB_CLOSED.
+  NOTIFICATION_TAB_CLOSING,
+
+  // Notification that a tab has been closed. The source is the
+  // NavigationController with no details.
+  NOTIFICATION_TAB_CLOSED,
+
+  // This notification is sent when a render view host has connected to a
+  // renderer process. The source is a Source<TabContents> with a pointer to
+  // the TabContents.  A TAB_CONTENTS_DISCONNECTED notification is
+  // guaranteed before the source pointer becomes junk.  No details are
+  // expected.
+  NOTIFICATION_TAB_CONTENTS_CONNECTED,
+
+  // This notification is sent when a TabContents swaps its render view host
+  // with another one, possibly changing processes. The source is a
+  // Source<TabContents> with a pointer to the TabContents.  A
+  // TAB_CONTENTS_DISCONNECTED notification is guaranteed before the
+  // source pointer becomes junk.  No details are expected.
+  NOTIFICATION_TAB_CONTENTS_SWAPPED,
+
+  // This message is sent after a TabContents is disconnected from the
+  // renderer process.  The source is a Source<TabContents> with a pointer to
+  // the TabContents (the pointer is usable).  No details are expected.
+  NOTIFICATION_TAB_CONTENTS_DISCONNECTED,
+
+  // This notification is sent after TabContents' title is updated. The source
+  // is a Source<TabContents> with a pointer to the TabContents. The details
+  // is a Details<TitleUpdatedDetails> that contains more information.
+  NOTIFICATION_TAB_CONTENTS_TITLE_UPDATED,
+
+  // This notification is sent when a TabContents is being hidden, e.g. due
+  // to switching away from this tab.  The source is a Source<TabContents>.
+  NOTIFICATION_TAB_CONTENTS_HIDDEN,
+
+  // This notification is sent when a TabContents is being destroyed. Any
+  // object holding a reference to a TabContents can listen to that
+  // notification to properly reset the reference. The source is a
+  // Source<TabContents>.
+  NOTIFICATION_TAB_CONTENTS_DESTROYED,
+
+  // A RenderViewHost was created for a TabContents. The source is the
+  // associated TabContents, and the details is the RenderViewHost
+  // pointer.
+  NOTIFICATION_RENDER_VIEW_HOST_CREATED_FOR_TAB,
+
+  // Notification than an interstitial has become associated with a tab. The
+  // source is the TabContents, the details not used.
+  NOTIFICATION_INTERSTITIAL_ATTACHED,
+
+  // Indicates that a RenderProcessHost was created and its handle is now
+  // available. The source will be the RenderProcessHost that corresponds to
+  // the process.
+  NOTIFICATION_RENDERER_PROCESS_CREATED,
+
+  // Indicates that a RenderProcessHost is destructing. The source will be the
+  // RenderProcessHost that corresponds to the process.
+  NOTIFICATION_RENDERER_PROCESS_TERMINATED,
+
+  // Indicates that a render process is starting to exit, such that it should
+  // not be used for future navigations.  The source will be the
+  // RenderProcessHost that corresponds to the process.
+  NOTIFICATION_RENDERER_PROCESS_CLOSING,
+
+  // Indicates that a render process was closed (meaning it exited, but the
+  // RenderProcessHost might be reused).  The source will be the corresponding
+  // RenderProcessHost.  The details will be a RendererClosedDetails struct.
+  // This may get sent along with RENDERER_PROCESS_TERMINATED.
+  NOTIFICATION_RENDERER_PROCESS_CLOSED,
+
+  // Indicates that a render process has become unresponsive for a period of
+  // time. The source will be the RenderWidgetHost that corresponds to the
+  // hung view, and no details are expected.
+  NOTIFICATION_RENDERER_PROCESS_HANG,
+
+  // This is sent to notify that the RenderViewHost displayed in a
+  // TabContents has changed.  Source is the TabContents for which the change
+  // happened, details is the previous RenderViewHost (can be NULL when the
+  // first RenderViewHost is set).
+  NOTIFICATION_RENDER_VIEW_HOST_CHANGED,
+
+  // Indicates that the render view host has received an accessibility tree
+  // update, either partial or full, from the render view.  The source is the
+  // RenderViewHost, the details are not used.
+  NOTIFICATION_RENDER_VIEW_HOST_ACCESSIBILITY_TREE_UPDATED,
+
+  // This is sent when a RenderWidgetHost is being destroyed. The source is
+  // the RenderWidgetHost, the details are not used.
+  NOTIFICATION_RENDER_WIDGET_HOST_DESTROYED,
+
+  // Sent when the widget is about to paint. The source is the
+  // RenderWidgetHost, the details are not used.
+  NOTIFICATION_RENDER_WIDGET_HOST_WILL_PAINT,
+
+  // Sent after the widget has painted. The source is the RenderWidgetHost,
+  // the details are not used.
+  NOTIFICATION_RENDER_WIDGET_HOST_DID_PAINT,
+
+  // This notifies the observer that a PaintAtSizeACK was received. The source
+  // is the RenderWidgetHost, the details are an instance of
+  // RenderWidgetHost::PaintAtSizeAckDetails.
+  NOTIFICATION_RENDER_WIDGET_HOST_DID_RECEIVE_PAINT_AT_SIZE_ACK,
+
+  // This notifies the observer that a HandleInputEventACK was received. The
+  // source is the RenderWidgetHost, the details are the type of event
+  // received.
+  // Note: The RenderWidgetHost may be deallocated at this point.
+  // Used only in testing.
+  NOTIFICATION_RENDER_WIDGET_HOST_DID_RECEIVE_INPUT_EVENT_ACK,
+
+  // Sent from RenderViewHost constructor. The source is the RenderViewHost,
+  // the details unused.
+  NOTIFICATION_RENDER_VIEW_HOST_CREATED,
+
+  // Sent from ~RenderViewHost. The source is the RenderViewHost, the details
+  // unused.
+  NOTIFICATION_RENDER_VIEW_HOST_DELETED,
+
+  // Sent from RenderViewHost::ClosePage.  The hosted RenderView has
+  // processed the onbeforeunload handler and is about to be sent a
+  // ViewMsg_ClosePage message to complete the tear-down process.  The source
+  // is the RenderViewHost sending the message, and no details are provided.
+  // Note:  This message is not sent in response to RenderView closure
+  // initiated by window.close().
+  NOTIFICATION_RENDER_VIEW_HOST_WILL_CLOSE_RENDER_VIEW,
+
+  // This notifies the observer that the drag operation ack in a drag and
+  // drop operation was received. The source is the RenderViewHost.
+  // Note: Used only in testing.
+  NOTIFICATION_RENDER_VIEW_HOST_DID_RECEIVE_DRAG_TARGET_DROP_ACK,
+
+  // Indicates a RenderWidgetHost has been hidden or restored. The source is
+  // the RWH whose visibility changed, the details is a bool set to true if
+  // the new state is "visible."
+  NOTIFICATION_RENDER_WIDGET_VISIBILITY_CHANGED,
+
+  // The focused element inside a page has changed.  The source is the
+  // TabContents containing the render view host for the page. The details is
+  // a Details<const bool> that indicates whether or not an editable node was
+  // focused.
+  NOTIFICATION_FOCUS_CHANGED_IN_PAGE,
+
+  // Notification posted from ExecuteJavascriptInWebFrameNotifyResult. The
+  // source is the RenderViewHost ExecuteJavascriptInWebFrameNotifyResult was
+  // invoked on. The details are a std::pair<int, Value*> with the int giving
+  // the id returned from ExecuteJavascriptInWebFrameNotifyResult and the
+  // Value the results of the javascript expression. The Value is owned by
+  // RenderViewHost and may be a Null Value.
+  NOTIFICATION_EXECUTE_JAVASCRIPT_RESULT,
+
+  // Child Processes ---------------------------------------------------------
+
+  // This notification is sent when a child process host has connected to a
+  // child process.  There is no usable source, since it is sent from an
+  // ephemeral task; register for AllSources() to receive this notification.
+  // The details are in a Details<ChildProcessInfo>.
+  NOTIFICATION_CHILD_PROCESS_HOST_CONNECTED,
+
+  // This message is sent after a ChildProcessHost is disconnected from the
+  // child process.  There is no usable source, since it is sent from an
+  // ephemeral task; register for AllSources() to receive this notification.
+  // The details are in a Details<ChildProcessInfo>.
+  NOTIFICATION_CHILD_PROCESS_HOST_DISCONNECTED,
+
+  // This message is sent when a child process disappears
+  // unexpectedly as a result of a crash.  There is no usable
+  // source, since it is sent from an ephemeral task; register for
+  // AllSources() to receive this notification.  The details are in
+  // a Details<ChildProcessInfo>.
+  NOTIFICATION_CHILD_PROCESS_CRASHED,
+
+  // This message is sent when a child process disappears
+  // unexpectedly as a result of a termination signal.  There is no
+  // usable source, since it is sent from an ephemeral task;
+  // register for AllSources() to receive this notification.  The
+  // details are in a Details<ChildProcessInfo>.
+  NOTIFICATION_CHILD_PROCESS_WAS_KILLED,
+
+  // This message indicates that an instance of a particular child was
+  // created in a page.  (If one page contains several regions rendered by
+  // the same child, this notification will occur once for each region
+  // during the page load.)
+  //
+  // There is no usable source, since it is sent from an ephemeral task;
+  // register for AllSources() to receive this notification.  The details are
+  // in a Details<ChildProcessInfo>.
+  NOTIFICATION_CHILD_INSTANCE_CREATED,
+
+  // Sent by the PluginUpdater when there is a change of plugin
+  // enable/disable status.
+  NOTIFICATION_PLUGIN_ENABLE_STATUS_CHANGED,
+
+  // Purge Memory ------------------------------------------------------------
+
+  // Sent on the IO thread when the system should try to reduce the amount of
+  // memory in use, no source or details are passed. See memory_purger.h .cc.
+  NOTIFICATION_PURGE_MEMORY,
+
+  // Sent before the repost form warning is brought up.
+  // The source is a NavigationController.
+  NOTIFICATION_REPOST_WARNING_SHOWN,
+
+  // Sent when the zoom level changes. The source is the HostZoomMap.  The
+  // details is a string of the hostname for which the zoom changed.  In case
+  // of a temporary zoom level change, the details is an empty string.
+  NOTIFICATION_ZOOM_LEVEL_CHANGED,
+
+  // Custom notifications used by the embedder should start from here.
+  NOTIFICATION_CONTENT_END,
 };
 
-inline bool operator==(NotificationType::Type a, NotificationType b) {
-  return a == b.value;
-}
-inline bool operator!=(NotificationType::Type a, NotificationType b) {
-  return a != b.value;
-}
+}  // namespace content
 
 #endif  // CONTENT_COMMON_NOTIFICATION_TYPE_H_