Simplify threading in browser thread by making only ChromeThread deal with di...

chrome/browser/renderer_host/file_system_accessor.cc

 // Copyright (c) 2006-2009 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/renderer_host/file_system_accessor.h"
 
 #include "base/file_util.h"
 #include "base/message_loop.h"
 #include "chrome/browser/chrome_thread.h"
 
 FileSystemAccessor::FileSystemAccessor(void* param, FileSizeCallback* callback)
     : param_(param), callback_(callback) {
   caller_loop_ = MessageLoop::current();
 }
 
 FileSystemAccessor::~FileSystemAccessor() {
 }
 
 void FileSystemAccessor::RequestFileSize(const FilePath& path,
                                          void* param,
                                          FileSizeCallback* callback) {
   // Getting file size could take long time if it lives on a network share,
   // so run it on FILE thread.
-  ChromeThread::GetMessageLoop(ChromeThread::FILE)->PostTask(
-      FROM_HERE,
+  ChromeThread::PostTask(
+      ChromeThread::FILE, FROM_HERE,
       NewRunnableMethod(new FileSystemAccessor(param, callback),
                         &FileSystemAccessor::GetFileSize, path));
 }
 
 void FileSystemAccessor::GetFileSize(const FilePath& path) {
   int64 result;
   // Set result to -1 if failed to get file size.
   if (!file_util::GetFileSize(path, &result))
     result = -1;
 
   // Pass the result back to the caller thread.
   caller_loop_->PostTask(
     FROM_HERE,
     NewRunnableMethod(this, &FileSystemAccessor::GetFileSizeCompleted, result));
 }
 
 void FileSystemAccessor::GetFileSizeCompleted(int64 result) {
   callback_->Run(result, param_);
 }