[chrome/renderer/media] Replace MessageLoopProxy usage with ThreadTaskRunnerHandle

chrome/renderer/media/cast_ipc_dispatcher.cc

 // Copyright 2014 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/renderer/media/cast_ipc_dispatcher.h"
 
+#include "base/single_thread_task_runner.h"
 #include "chrome/common/cast_messages.h"
 #include "chrome/renderer/media/cast_transport_sender_ipc.h"
 #include "ipc/ipc_message_macros.h"
 
 CastIPCDispatcher* CastIPCDispatcher::global_instance_ = NULL;
 
 CastIPCDispatcher::CastIPCDispatcher(
-    const scoped_refptr<base::MessageLoopProxy>& io_message_loop)
+    const scoped_refptr<base::SingleThreadTaskRunner>& io_message_loop)
     : sender_(NULL),
       io_message_loop_(io_message_loop) {
   DCHECK(io_message_loop_.get());
   DCHECK(!global_instance_);
 }
 
 CastIPCDispatcher::~CastIPCDispatcher() {
   DCHECK(io_message_loop_->BelongsToCurrentThread());
   DCHECK(!global_instance_);
 }
@@ skipping 102 matching lines @@
 void CastIPCDispatcher::OnReceivedPacket(
     int32 channel_id,
     const media::cast::Packet& packet) {
   CastTransportSenderIPC* sender = id_map_.Lookup(channel_id);
   if (sender) {
     sender->OnReceivedPacket(packet);
   } else {
     DVLOG(1) << "CastIPCDispatcher::OnReceievdPacket on non-existing channel.";
   }
 }