Limit number of notifications that can be received by the client.

chrome/browser/extensions/app_notification_manager.h

Index: chrome/browser/extensions/app_notification_manager.h
===================================================================
--- chrome/browser/extensions/app_notification_manager.h	(revision 109957)
+++ chrome/browser/extensions/app_notification_manager.h	(working copy)
@@ -29,6 +29,7 @@
       public content::NotificationObserver,
       public SyncableService {
  public:
+  static const unsigned int kMaxNotificationPerApp;
   explicit AppNotificationManager(Profile* profile);
   virtual ~AppNotificationManager();
 
@@ -130,6 +131,9 @@
   // Sends a change to syncer to add the given notification.
   void SyncAddChange(const AppNotification& notif);
 
+  // Sends a change to syncer to remove the given notification.
+  void SyncRemoveChange(const AppNotification& notif);
+
   // Sends changes to syncer to remove all notifications in the given list.
   void SyncClearAllChange(const AppNotificationList& list);