Remove the old signature of NotificationManager::closePersistent().

content/child/notifications/notification_manager.h

 // Copyright 2014 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 CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_MANAGER_H_
 #define CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_MANAGER_H_
 
 #include <map>
 #include <set>
 
@@ skipping 31 matching lines @@
                     blink::WebNotificationDelegate* delegate);
   virtual void showPersistent(
       const blink::WebSerializedOrigin& origin,
       const blink::WebNotificationData& notification_data,
       blink::WebServiceWorkerRegistration* service_worker_registration,
       blink::WebNotificationShowCallbacks* callbacks);
   virtual void close(blink::WebNotificationDelegate* delegate);
   virtual void closePersistent(
       const blink::WebSerializedOrigin& origin,
       const blink::WebString& persistent_notification_id);
-  // TODO(peter): Remove this method when Blink has been updated.
-  virtual void closePersistent(
-      const blink::WebString& persistent_notification_id);
   virtual void notifyDelegateDestroyed(
       blink::WebNotificationDelegate* delegate);
   virtual blink::WebNotificationPermission checkPermission(
       const blink::WebSerializedOrigin& origin);
 
   // Called by the NotificationDispatcher.
   bool OnMessageReceived(const IPC::Message& message);
 
  private:
   NotificationManager(
@@ skipping 36 matching lines @@
 
   // Map to store the delegate associated with a notification request Id.
   std::map<int, blink::WebNotificationDelegate*> active_page_notifications_;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_MANAGER_H_