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

components/gcm_driver/gcm_driver_desktop.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_DRIVER_DESKTOP_H_
 #define COMPONENTS_GCM_DRIVER_GCM_DRIVER_DESKTOP_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 41 matching lines @@
       const base::FilePath& store_path,
       const scoped_refptr<net::URLRequestContextGetter>& request_context,
       const scoped_refptr<base::SequencedTaskRunner>& ui_thread,
       const scoped_refptr<base::SequencedTaskRunner>& io_thread,
       const scoped_refptr<base::SequencedTaskRunner>& blocking_task_runner);
   virtual ~GCMDriverDesktop();
 
   // GCMDriver overrides:
   virtual void Shutdown() override;
   virtual void OnSignedIn() override;
+  virtual void OnSignedOut() override;
   virtual void Purge() override;
   virtual void AddAppHandler(const std::string& app_id,
                              GCMAppHandler* handler) override;
   virtual void RemoveAppHandler(const std::string& app_id) 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;
@@ skipping 96 matching lines @@
 
   // Used to pass a weak pointer to the IO worker.
   base::WeakPtrFactory<GCMDriverDesktop> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMDriverDesktop);
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_DRIVER_DESKTOP_H_