Merge ChromeOS and SyncFS XMPP Notification into one class

chrome/browser/google_apis/drive_notification_observer.h

 // Copyright (c) 2013 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_GOOGLE_APIS_DRIVE_NOTIFICATION_OBSERVER_H_
 #define CHROME_BROWSER_GOOGLE_APIS_DRIVE_NOTIFICATION_OBSERVER_H_
 
 namespace google_apis {
 
 // Interface for classes which need to know when to check Google Drive for
 // updates.
 class DriveNotificationObserver {
  public:
-  // Called when an observer should check Google Drive for updates.
-  virtual void CheckForUpdates() = 0;
+  // Called when a notification from Google Drive is received.
+  virtual void OnNotificationReceived() = 0;
 
  protected:
   virtual ~DriveNotificationObserver() {}
 };
 
 }  // namespace google_apis
 
 #endif  // CHROME_BROWSER_GOOGLE_APIS_DRIVE_NOTIFICATION_OBSERVER_H_