Implement cancel() API on a Notification object so that script can cancel or ...

chrome/browser/notifications/notification_ui_manager.h

 // Copyright (c) 2009 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_BROWSER_NOTIFICATIONS_NOTIFICATION_UI_MANAGER_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_UI_MANAGER_H_
 
 #include <deque>
 
 #include "base/id_map.h"
@@ skipping 24 matching lines @@
   void Initialize(BalloonCollection* balloon_collection) {
     DCHECK(!balloon_collection_.get());
     DCHECK(balloon_collection);
     balloon_collection_.reset(balloon_collection);
   }
 
   // Adds a notification to be displayed. Virtual for unit test override.
   virtual void Add(const Notification& notification,
                    Profile* profile);
 
+  // Removes a notification.
+  virtual bool Cancel(const Notification& notification);
+
  private:
   // Attempts to display notifications from the show_queue if the user
   // is active.
   void CheckAndShowNotifications();
 
   // Attempts to display notifications from the show_queue.
   void ShowNotifications();
 
   // BalloonCollectionObserver implementation.
   virtual void OnBalloonSpaceChanged();
 
   // An owned pointer to the collection of active balloons.
   scoped_ptr<BalloonCollection> balloon_collection_;
 
   // A queue of notifications which are waiting to be shown.
   typedef std::deque<QueuedNotification*> NotificationDeque;
   NotificationDeque show_queue_;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationUIManager);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_UI_MANAGER_H_