Remove gcm channel state supported by sync service.

chrome/common/pref_names.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/common/pref_names.h"
 
 #include "base/basictypes.h"
 #include "chrome/common/pref_font_webkit_names.h"
 
 namespace prefs {
@@ skipping 1188 matching lines @@
 
 // Enable notifications for new devices on the local network that can be
 // registered to the user's account, e.g. Google Cloud Print printers.
 const char kLocalDiscoveryNotificationsEnabled[] =
     "local_discovery.notifications_enabled";
 
 // A timestamp (stored in base::Time::ToInternalValue format) of the last time
 // a preference was reset.
 const char kPreferenceResetTime[] = "prefs.preference_reset_time";
 
-// The GCM channel's enabled state.
-const char kGCMChannelEnabled[] = "gcm.channel_enabled";
-
 // How many Service Workers are registered with the Push API (could be zero).
 const char kPushMessagingRegistrationCount[] =
     "gcm.push_messaging_registration_count";
 
 // Whether a user is allowed to use Easy Unlock.
 const char kEasyUnlockAllowed[] = "easy_unlock.allowed";
 
 // Whether Easy Unlock is enabled.
 const char kEasyUnlockEnabled[] = "easy_unlock.enabled";
 
@@ skipping 1056 matching lines @@
 const char kPasswordBubbleNopesCount[] = "password_bubble.nopes";
 
 // Last user's interaction with the password bubble.
 const char kPasswordBubbleLastInteractions[] = "password_bubble.interactions";
 
 // Boolean that indicates whether elevation is needed to recover Chrome upgrade.
 const char kRecoveryComponentNeedsElevation[] =
     "recovery_component.needs_elevation";
 
 }  // namespace prefs