fix build after clang roll

chrome/browser/sync_file_system/drive_backend/sync_engine.cc

 // Copyright 2013 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_file_system/drive_backend/sync_engine.h"
 
 #include "base/bind.h"
 #include "base/values.h"
 #include "chrome/browser/drive/drive_api_service.h"
 #include "chrome/browser/sync_file_system/drive_backend/drive_backend_constants.h"
@@ skipping 12 matching lines @@
     const base::FilePath& base_dir,
     base::SequencedTaskRunner* task_runner,
     scoped_ptr<drive::DriveAPIService> drive_service,
     drive::DriveNotificationManager* notification_manager,
     ExtensionService* extension_service)
     : base_dir_(base_dir),
       task_runner_(task_runner),
       drive_service_(drive_service.Pass()),
       notification_manager_(notification_manager),
       extension_service_(extension_service),
-      task_manager_(weak_ptr_factory_.GetWeakPtr()),
-      weak_ptr_factory_(this) {
+      weak_ptr_factory_(this),
+      task_manager_(weak_ptr_factory_.GetWeakPtr()) {
 }
 
 SyncEngine::~SyncEngine() {
   NOTIMPLEMENTED();
 }
 
 void SyncEngine::Initialize() {
   task_manager_.Initialize(SYNC_STATUS_OK);
 
   SyncEngineInitializer* initializer =
@@ skipping 180 matching lines @@
 }
 
 void SyncEngine::DidApplyLocalChange(LocalToRemoteSyncer* syncer,
                                      const SyncStatusCallback& callback,
                                      SyncStatusCode status) {
   NOTIMPLEMENTED();
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system