Remove gcm channel state supported by sync service.

components/gcm_driver/gcm_channel_status_syncer.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_CHANNEL_STATUS_SYNCER_H_
 #define COMPONENTS_GCM_DRIVER_GCM_CHANNEL_STATUS_SYNCER_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ skipping 10 matching lines @@
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 namespace gcm {
 
 class GCMChannelStatusRequest;
 class GCMDriver;
 
+namespace prefs {
+// The GCM channel's enabled state.
+extern const char kGCMChannelStatus[];
+}  // namepsace prefs
+
 // Syncing with the server for GCM channel status that controls if GCM
 // functionality should be enabled or disabled.
 class GCMChannelStatusSyncer {
  public:
   static void RegisterPrefs(PrefRegistrySimple* registry);
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
   GCMChannelStatusSyncer(
       GCMDriver* driver,
       PrefService* prefs,
@@ skipping 61 matching lines @@
 
   // Used to pass a weak pointer to a task.
   base::WeakPtrFactory<GCMChannelStatusSyncer> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMChannelStatusSyncer);
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_CHANNEL_STATUS_SYNCER_H_