[GCM] Remove GCMDriver::Purge and GCMClient::CheckOut

components/gcm_driver/gcm_client.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 COMPONENTS_GCM_DRIVER_GCM_CLIENT_H_
 #define COMPONENTS_GCM_DRIVER_GCM_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 228 matching lines @@
       Delegate* delegate) = 0;
 
   // Starts the GCM service by first loading the data from the persistent store.
   // This will then kick off the check-in if the check-in info is not found in
   // the store.
   virtual void Start() = 0;
 
   // Stops using the GCM service. This will not erase the persisted data.
   virtual void Stop() = 0;
 
-  // Checks out of the GCM service. This will erase all the cached and persisted
-  // data.
-  virtual void CheckOut() = 0;
-
   // Registers the application for GCM. Delegate::OnRegisterFinished will be
   // called asynchronously upon completion.
   // |app_id|: application ID.
   // |sender_ids|: list of IDs of the servers that are allowed to send the
   //               messages to the application. These IDs are assigned by the
   //               Google API Console.
   virtual void Register(const std::string& app_id,
                         const std::vector<std::string>& sender_ids) = 0;
 
   // Unregisters the application from GCM when it is uninstalled.
@@ skipping 36 matching lines @@
   // Sets last token fetch time in persistent store.
   virtual void SetLastTokenFetchTime(const base::Time& time) = 0;
 
   // Updates the timer used by the HeartbeatManager for sending heartbeats.
   virtual void UpdateHeartbeatTimer(scoped_ptr<base::Timer> timer) = 0;
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_CLIENT_H_