[GCM] Make sure GCM checkout logic is invoked when the profile is signed out

chrome/browser/sync/profile_sync_service.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/sync/profile_sync_service.h"
 
 #include <cstddef>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 1064 matching lines @@
     return;
 
   current_experiments_ = experiments;
 
   // Handle preference-backed experiments first.
   if (experiments.gcm_channel_state != syncer::Experiments::UNSET) {
     profile()->GetPrefs()->SetBoolean(prefs::kGCMChannelEnabled,
                                       experiments.gcm_channel_state ==
                                           syncer::Experiments::ENABLED);
     gcm::GCMProfileServiceFactory::GetForProfile(profile());
+  } else {
+    profile()->GetPrefs()->ClearPref(prefs::kGCMChannelEnabled);
   }
 
   if (experiments.enhanced_bookmarks_enabled) {
     profile_->GetPrefs()->SetBoolean(prefs::kEnhancedBookmarksExperimentEnabled,
                                      true);
     profile_->GetPrefs()->SetString(prefs::kEnhancedBookmarksExtensionId,
                                     experiments.enhanced_bookmarks_ext_id);
   }
 
   // If this is a first time sync for a client, this will be called before
@@ skipping 1146 matching lines @@
   status.last_get_token_error = last_get_token_error_;
   if (request_access_token_retry_timer_.IsRunning())
     status.next_token_request_time = next_token_request_time_;
   return status;
 }
 
 void ProfileSyncService::OverrideNetworkResourcesForTest(
     scoped_ptr<syncer::NetworkResources> network_resources) {
   network_resources_ = network_resources.Pass();
 }