Keep the GCM data intact when the user signs out of the profile

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();
   virtual ~FakeGCMDriver();
 
   // GCMDriver overrides:
   virtual void Shutdown() override;
   virtual void AddAppHandler(const std::string& app_id,
                              GCMAppHandler* handler) override;
   virtual void RemoveAppHandler(const std::string& app_id) override;
   virtual void OnSignedIn() override;
+  virtual void OnSignedOut() override;
   virtual void Purge() override;
   virtual void AddConnectionObserver(GCMConnectionObserver* observer) override;
   virtual void RemoveConnectionObserver(
       GCMConnectionObserver* observer) override;
   virtual void Enable() override;
   virtual void Disable() override;
   virtual GCMClient* GetGCMClientForTesting() const override;
   virtual bool IsStarted() const override;
   virtual bool IsConnected() const override;
   virtual void GetGCMStatistics(const GetGCMStatisticsCallback& callback,
@@ skipping 17 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_