[GCM] Updating GCM Status Syncer to the new Experiment Status pb

sync/protocol/BUILD.gn

 # 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.
 
 import("//third_party/protobuf/proto_library.gni")
 
 proto_library("protocol") {
   sources = [
     "app_notification_specifics.proto",
     "app_setting_specifics.proto",
     "app_specifics.proto",
     "app_list_specifics.proto",
     "article_specifics.proto",
     "attachments.proto",
     "autofill_specifics.proto",
     "bookmark_specifics.proto",
     "client_commands.proto",
     "client_debug_info.proto",
     "device_info_specifics.proto",
     "dictionary_specifics.proto",
     "encryption.proto",
     "enhanced_bookmark_specifics.proto",
+    "experiment_status.proto",
     "experiments_specifics.proto",
     "extension_setting_specifics.proto",
     "extension_specifics.proto",
     "favicon_image_specifics.proto",
     "favicon_tracking_specifics.proto",
     "get_updates_caller_info.proto",
     "history_delete_directive_specifics.proto",
     "nigori_specifics.proto",
     "managed_user_setting_specifics.proto",
     "managed_user_shared_setting_specifics.proto",
@@ skipping 15 matching lines @@
     "unique_position.proto",
   ]
 
   cc_generator_options = "dllexport_decl=SYNC_PROTO_EXPORT:"
   cc_include = "sync/protocol/sync_proto_export.h"
 
   defines = [ "SYNC_PROTO_IMPLEMENTATION" ]
 
   extra_configs = [ "//build/config/compiler:wexit_time_destructors" ]
 }