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

chrome/renderer/notification_provider.cc

 // 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.
 
 #include "chrome/renderer/notification_provider.h"
 
 #include "base/task.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/renderer/render_thread.h"
 #include "chrome/renderer/render_view.h"
@@ skipping 13 matching lines @@
   int notification_id = manager_.RegisterNotification(notification);
   if (notification.isHTML())
     return ShowHTML(notification, notification_id);
   else
     return ShowText(notification, notification_id);
 }
 
 void NotificationProvider::cancel(const WebNotification& notification) {
   int id;
   bool id_found = manager_.GetId(notification, id);
-  DCHECK(id_found);
+  // Won't be found if the notification has already been closed by the user.
   if (id_found)
     Send(new ViewHostMsg_CancelDesktopNotification(view_->routing_id(), id));
 }
 
 void NotificationProvider::objectDestroyed(
     const WebNotification& notification) {
   int id;
   bool id_found = manager_.GetId(notification, id);
-  DCHECK(id_found);
+  // Won't be found if the notification has already been closed by the user.
   if (id_found)
     manager_.UnregisterNotification(id);
 }
 
 WebNotificationPresenter::Permission NotificationProvider::checkPermission(
     const WebString& origin) {
   int permission;
   Send(new ViewHostMsg_CheckNotificationPermission(view_->routing_id(),
                                                    GURL(origin), &permission));
   return static_cast<WebNotificationPresenter::Permission>(permission);
@@ skipping 68 matching lines @@
 void NotificationProvider::OnPermissionRequestComplete(int id) {
   WebNotificationPermissionCallback* callback = manager_.GetCallback(id);
   DCHECK(callback);
   callback->permissionRequestComplete();
   manager_.OnPermissionRequestComplete(id);
 }
 
 bool NotificationProvider::Send(IPC::Message* message) {
   return RenderThread::current()->Send(message);
 }