sync: remove use of protobuf extensions in protocol to reduce static init overhead.

chrome/browser/extensions/settings/settings_sync_util.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/extensions/settings/settings_sync_util.h"
 
 #include "base/values.h"
 #include "base/json/json_writer.h"
 #include "chrome/browser/sync/protocol/app_setting_specifics.pb.h"
 #include "chrome/browser/sync/protocol/extension_setting_specifics.pb.h"
+#include "chrome/browser/sync/protocol/sync.pb.h"
 
 namespace extensions {
 
 namespace settings_sync_util {
 
 namespace {
 
 void PopulateExtensionSettingSpecifics(
     const std::string& extension_id,
     const std::string& key,
@@ skipping 18 matching lines @@
 }
 
 }  // namespace
 
 SyncData CreateData(
     const std::string& extension_id,
     const std::string& key,
     const Value& value,
     syncable::ModelType type) {
   sync_pb::EntitySpecifics specifics;
-
   switch (type) {
     case syncable::EXTENSION_SETTINGS:
       PopulateExtensionSettingSpecifics(
           extension_id,
           key,
           value,
-          specifics.MutableExtension(sync_pb::extension_setting));
+          specifics.mutable_extension_setting());
       break;
 
     case syncable::APP_SETTINGS:
       PopulateAppSettingSpecifics(
           extension_id,
           key,
           value,
-          specifics.MutableExtension(sync_pb::app_setting));
+          specifics.mutable_app_setting());
       break;
 
     default:
       NOTREACHED();
   }
 
   return SyncData::CreateLocalData(extension_id + "/" + key, key, specifics);
 }
 
 SyncChange CreateAdd(
@@ skipping 19 matching lines @@
     const std::string& key,
     syncable::ModelType type) {
   DictionaryValue no_value;
   return SyncChange(
       SyncChange::ACTION_DELETE, CreateData(extension_id, key, no_value, type));
 }
 
 }  // namespace settings_sync_util
 
 }  // namespace extensions