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

components/gcm_driver/gcm_client_impl.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_IMPL_H_
 #define COMPONENTS_GCM_DRIVER_GCM_CLIENT_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 75 matching lines @@
   void Initialize(
       const ChromeBuildInfo& chrome_build_info,
       const base::FilePath& store_path,
       const scoped_refptr<base::SequencedTaskRunner>& blocking_task_runner,
       const scoped_refptr<net::URLRequestContextGetter>&
           url_request_context_getter,
       scoped_ptr<Encryptor> encryptor,
       GCMClient::Delegate* delegate) override;
   void Start() override;
   void Stop() override;
-  void CheckOut() override;
   void Register(const std::string& app_id,
                 const std::vector<std::string>& sender_ids) override;
   void Unregister(const std::string& app_id) override;
   void Send(const std::string& app_id,
             const std::string& receiver_id,
             const OutgoingMessage& message) override;
   void SetRecording(bool recording) override;
   void ClearActivityLogs() override;
   GCMStatistics GetStatistics() const override;
   void SetAccountTokens(
@@ skipping 217 matching lines @@
 
   // Factory for creating references in callbacks.
   base::WeakPtrFactory<GCMClientImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMClientImpl);
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_CLIENT_IMPL_H_