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

chrome/browser/sync/abstract_profile_sync_service_test.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/abstract_profile_sync_service_test.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "chrome/browser/sync/internal_api/write_transaction.h"
@@ skipping 43 matching lines @@
   node.Put(UNIQUE_SERVER_TAG, tag_name);
   node.Put(IS_DIR, true);
   node.Put(SERVER_IS_DIR, false);
   node.Put(IS_UNSYNCED, false);
   node.Put(IS_UNAPPLIED_UPDATE, false);
   node.Put(SERVER_VERSION, 20);
   node.Put(BASE_VERSION, 20);
   node.Put(IS_DEL, false);
   node.Put(syncable::ID, ids->MakeServer(tag_name));
   sync_pb::EntitySpecifics specifics;
-  syncable::AddDefaultExtensionValue(model_type, &specifics);
+  syncable::AddDefaultFieldValue(model_type, &specifics);
   node.Put(SPECIFICS, specifics);
 
   return true;
 }
 
 /* static */
 sync_api::ImmutableChangeRecordList
     ProfileSyncServiceTestHelper::MakeSingletonChangeRecordList(
         int64 node_id, sync_api::ChangeRecord::Action action) {
   sync_api::ChangeRecord record;
@@ skipping 70 matching lines @@
   return callback_;
 }
 
 bool CreateRootHelper::success() {
   return success_;
 }
 
 void CreateRootHelper::CreateRootCallback() {
   success_ = test_->CreateRoot(model_type_);
 }