Moving file_system_proxy to base/ and changing it to work with MessageLoopPro...

chrome/browser/chrome_thread_relay.cc

-// Copyright (c) 2010 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/chrome_thread_relay.h"
-
-ChromeThreadRelay::ChromeThreadRelay() {
-  if (!ChromeThread::GetCurrentThreadIdentifier(&origin_thread_id_))
-    NOTREACHED() << "Must be created on a valid ChromeThread";
-}
-
-void ChromeThreadRelay::Start(ChromeThread::ID target_thread_id,
-                              const tracked_objects::Location& from_here) {
-  ChromeThread::PostTask(
-      target_thread_id,
-      from_here,
-      NewRunnableMethod(this, &ChromeThreadRelay::ProcessOnTargetThread));
-}
-
-void ChromeThreadRelay::ProcessOnTargetThread() {
-  RunWork();
-  ChromeThread::PostTask(
-      origin_thread_id_,
-      FROM_HERE,
-      NewRunnableMethod(this, &ChromeThreadRelay::RunCallback));
-}