[chrome/browser] Replace MessageLoopProxy usage with ThreadTaskRunnerHandle

chrome/browser/icon_loader.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/icon_loader.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
+#include "base/thread_task_runner_handle.h"
 #include "content/public/browser/browser_thread.h"
 
 using content::BrowserThread;
 
 IconLoader::IconLoader(const base::FilePath& file_path,
                        IconSize size,
                        Delegate* delegate)
-    : target_message_loop_(NULL),
+    : target_task_runner_(NULL),
       file_path_(file_path),
       icon_size_(size),
       delegate_(delegate) {}
 
 IconLoader::~IconLoader() {
 }
 
 void IconLoader::Start() {
-  target_message_loop_ = base::MessageLoopProxy::current();
+  target_task_runner_ = base::ThreadTaskRunnerHandle::Get();
 
   BrowserThread::PostTaskAndReply(BrowserThread::FILE, FROM_HERE,
       base::Bind(&IconLoader::ReadGroup, this),
       base::Bind(&IconLoader::OnReadGroup, this));
 }
 
 void IconLoader::ReadGroup() {
   group_ = ReadGroupIDFromFilepath(file_path_);
 }
 
 void IconLoader::OnReadGroup() {
   if (IsIconMutableFromFilepath(file_path_) ||
       !delegate_->OnGroupLoaded(this, group_)) {
     BrowserThread::PostTask(ReadIconThreadID(), FROM_HERE,
         base::Bind(&IconLoader::ReadIcon, this));
   }
 }
 
 void IconLoader::NotifyDelegate() {
   // If the delegate takes ownership of the Image, release it from the scoped
   // pointer.
   if (delegate_->OnImageLoaded(this, image_.get(), group_))
     ignore_result(image_.release());  // Can't ignore return value.
 }