Refactor shutdown code to allow win/linux to run after last browser closes.

chrome/common/notification_type.h

 // Copyright (c) 2010 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 CHROME_COMMON_NOTIFICATION_TYPE_H_
 #define CHROME_COMMON_NOTIFICATION_TYPE_H_
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
 //
@@ skipping 180 matching lines @@
     // 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 application will be closed as a result of
-    // this browser window closure (i.e. this was the last opened browser
-    // window on win/linux).  Note that the boolean pointed to by details is
-    // only valid for the duration of this call.
+    // 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,
 
 #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,
+#endif
 
-    // This message is sent when the application is terminating (Mac OS X only
-    // at present). No source or details are passed.
+    // 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,
 
+#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,
 #endif
 
     // This is sent when the user has chosen to exit the app, but before any
     // browsers have closed. This is only sent if the user chooses the exit menu
     // item, not if Chrome exists by some other means (such as the user closing
     // the last window). The source and details are unspecified.
@@ skipping 871 matching lines @@
 };
 
 inline bool operator==(NotificationType::Type a, NotificationType b) {
   return a == b.value;
 }
 inline bool operator!=(NotificationType::Type a, NotificationType b) {
   return a != b.value;
 }
 
 #endif  // CHROME_COMMON_NOTIFICATION_TYPE_H_