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

components/gcm_driver/fake_gcm_driver.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_FAKE_GCM_DRIVER_H_
 #define COMPONENTS_GCM_DRIVER_FAKE_GCM_DRIVER_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "components/gcm_driver/gcm_driver.h"
 
 namespace gcm {
 
 class FakeGCMDriver : public GCMDriver {
  public:
   FakeGCMDriver();
   ~FakeGCMDriver() override;
 
   // GCMDriver overrides:
   void Shutdown() override;
   void AddAppHandler(const std::string& app_id,
                      GCMAppHandler* handler) override;
   void RemoveAppHandler(const std::string& app_id) override;
   void OnSignedIn() override;
   void OnSignedOut() override;
-  void Purge() override;
   void AddConnectionObserver(GCMConnectionObserver* observer) override;
   void RemoveConnectionObserver(GCMConnectionObserver* observer) override;
   void Enable() override;
   void Disable() override;
   GCMClient* GetGCMClientForTesting() const override;
   bool IsStarted() const override;
   bool IsConnected() const override;
   void GetGCMStatistics(const GetGCMStatisticsCallback& callback,
                         bool clear_logs) override;
   void SetGCMRecording(const GetGCMStatisticsCallback& callback,
@@ skipping 16 matching lines @@
                 const std::string& receiver_id,
                 const GCMClient::OutgoingMessage& message) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FakeGCMDriver);
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_FAKE_GCM_DRIVER_H_