Remove all remaining traces of MessageLoopProxy.

chrome/browser/sync/profile_sync_service_factory.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/profile_sync_service_factory.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
@@ skipping 161 matching lines @@
 
   init_params.sync_client =
       base::WrapUnique(new browser_sync::ChromeSyncClient(profile));
 
   init_params.network_time_update_callback = base::Bind(&UpdateNetworkTime);
   init_params.base_directory = profile->GetPath();
   init_params.url_request_context = profile->GetRequestContext();
   init_params.debug_identifier = profile->GetDebugName();
   init_params.channel = chrome::GetChannel();
 
-  init_params.db_thread = content::BrowserThread::GetMessageLoopProxyForThread(
+  init_params.db_thread = content::BrowserThread::GetTaskRunnerForThread(
       content::BrowserThread::DB);
-  init_params.file_thread =
-      content::BrowserThread::GetMessageLoopProxyForThread(
-          content::BrowserThread::FILE);
+  init_params.file_thread = content::BrowserThread::GetTaskRunnerForThread(
+      content::BrowserThread::FILE);
   init_params.blocking_pool = content::BrowserThread::GetBlockingPool();
 
   auto pss = base::WrapUnique(new ProfileSyncService(std::move(init_params)));
 
   // Will also initialize the sync client.
   pss->Initialize();
   return pss.release();
 }
 
 // static
 bool ProfileSyncServiceFactory::HasProfileSyncService(Profile* profile) {
   return GetInstance()->GetServiceForBrowserContext(profile, false) != NULL;
 }