Use base::MessageLoop in more files.

chrome/browser/sync/glue/ui_model_worker.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/glue/ui_model_worker.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/message_loop.h"
 #include "base/synchronization/waitable_event.h"
@@ skipping 61 matching lines @@
     base::ThreadRestrictions::ScopedAllowWait allow_wait;
     // Wait for either a new task or SyncerThread termination.
     syncapi_event_.Wait();
   }
 
   state_ = STOPPED;
 }
 
 void UIModelWorker::RegisterForLoopDestruction() {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  MessageLoop::current()->AddDestructionObserver(this);
+  base::MessageLoop::current()->AddDestructionObserver(this);
 }
 
 syncer::SyncerError UIModelWorker::DoWorkAndWaitUntilDoneImpl(
     const syncer::WorkCallback& work) {
   // In most cases, this method is called in WORKING state. It is possible this
   // gets called when we are in the RUNNING_MANUAL_SHUTDOWN_PUMP state, because
   // the UI loop has initiated shutdown but the syncer hasn't got the memo yet.
   // This is fine, the work will get scheduled and run normally or run by our
   // code handling this case in Stop(). Note there _no_ way we can be in here
   // with state_ = STOPPED, so it is safe to read / compare in this case.
@@ skipping 42 matching lines @@
 
   syncapi_has_shutdown_ = true;
   syncapi_event_.Signal();
 }
 
 UIModelWorker::~UIModelWorker() {
   DCHECK_EQ(state_, STOPPED);
 }
 
 }  // namespace browser_sync