Revert "content: convert SSL notifications to observer usage"

content/public/browser/notification_types.h

Index: content/public/browser/notification_types.h
diff --git a/content/public/browser/notification_types.h b/content/public/browser/notification_types.h
index cfaafd53610fcefb0312b8fed4278e7c0864a724..4c3bd7153e5722169a89ea6c6835aeb6993d8bb6 100644
--- a/content/public/browser/notification_types.h
+++ b/content/public/browser/notification_types.h
@@ -102,6 +102,40 @@ enum NotificationType {
   // issued.  Details in the form of a ResourceRedirectDetails are provided.
   NOTIFICATION_RESOURCE_RECEIVED_REDIRECT,
 
+  // 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 browser context. The details will be the navigation
+  // controller associated with the state change.
+  NOTIFICATION_SSL_INTERNAL_STATE_CHANGED,
+
   // Devtools ------------------------------------------------------------------
 
   // Indicates that a devtools agent has attached to a client. The source is