Remove gcm channel state supported by sync service.

sync/internal_api/public/util/experiments.h

Index: sync/internal_api/public/util/experiments.h
diff --git a/sync/internal_api/public/util/experiments.h b/sync/internal_api/public/util/experiments.h
index d2b82c62363dadea5267785990b38c0991b6653b..16fa14972b2750c79c3f01308a63ea44f7445d75 100644
--- a/sync/internal_api/public/util/experiments.h
+++ b/sync/internal_api/public/util/experiments.h
@@ -13,29 +13,20 @@ namespace syncer {
 
 const char kFaviconSyncTag[] = "favicon_sync";
 const char kPreCommitUpdateAvoidanceTag[] = "pre_commit_update_avoidance";
-const char kGCMChannelTag[] = "gcm_channel";
 const char kEnhancedBookmarksTag[] = "enhanced_bookmarks";
 const char kGCMInvalidationsTag[] = "gcm_invalidations";
 const char kWalletSyncTag[] = "wallet_sync";
 
 // A structure to hold the enable status of experimental sync features.
 struct Experiments {
-  enum GCMChannelState {
-    UNSET,
-    SUPPRESSED,
-    ENABLED,
-  };
-
   Experiments()
       : favicon_sync_limit(200),
-        gcm_channel_state(UNSET),
         enhanced_bookmarks_enabled(false),
         gcm_invalidations_enabled(true),  // By default GCM channel is enabled.
         wallet_sync_enabled(false) {}
 
   bool Matches(const Experiments& rhs) {
     return (favicon_sync_limit == rhs.favicon_sync_limit &&
-            gcm_channel_state == rhs.gcm_channel_state &&
             enhanced_bookmarks_enabled == rhs.enhanced_bookmarks_enabled &&
             enhanced_bookmarks_ext_id == rhs.enhanced_bookmarks_ext_id &&
             gcm_invalidations_enabled == rhs.gcm_invalidations_enabled &&
@@ -45,9 +36,6 @@ struct Experiments {
   // The number of favicons that a client is permitted to sync.
   int favicon_sync_limit;
 
-  // Enable state of the GCM channel.
-  GCMChannelState gcm_channel_state;
-
   // Enable the enhanced bookmarks sync datatype.
   bool enhanced_bookmarks_enabled;