sync: Use base::MessageLoop.

sync/test/engine/fake_sync_scheduler.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 "sync/test/engine/fake_sync_scheduler.h"
 
 namespace syncer {
 
 FakeSyncScheduler::FakeSyncScheduler()
-    : created_on_loop_(MessageLoop::current()) {}
+    : created_on_loop_(base::MessageLoop::current()) {}
 
 FakeSyncScheduler::~FakeSyncScheduler() {}
 
 void FakeSyncScheduler::Start(Mode mode) {
 }
 
 void FakeSyncScheduler::RequestStop(const base::Closure& callback) {
   created_on_loop_->PostTask(FROM_HERE, callback);
 }
 
@@ skipping 51 matching lines @@
 }
 
 void FakeSyncScheduler::OnShouldStopSyncingPermanently() {
 }
 
 void FakeSyncScheduler::OnSyncProtocolError(
      const sessions::SyncSessionSnapshot& snapshot) {
 }
 
 }  // namespace syncer