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

chrome/renderer/media/cast_ipc_dispatcher.h

 // 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.
 
 #ifndef CHROME_RENDERER_MEDIA_CAST_IPC_DISPATCHER_H_
 #define CHROME_RENDERER_MEDIA_CAST_IPC_DISPATCHER_H_
 
 #include "base/callback.h"
 #include "base/id_map.h"
+#include "base/thread_task_runner_handle.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ipc/message_filter.h"
 #include "media/cast/cast_sender.h"
 #include "media/cast/logging/logging_defines.h"
 #include "media/cast/net/cast_transport_sender.h"
 
 class CastTransportSenderIPC;
 
 // This dispatcher listens to incoming IPC messages and sends
 // the call to the correct CastTransportSenderIPC instance.
 class CastIPCDispatcher : public IPC::MessageFilter {
  public:
   explicit CastIPCDispatcher(
-      const scoped_refptr<base::MessageLoopProxy>& io_message_loop);
+      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
 
   static CastIPCDispatcher* Get();
   void Send(IPC::Message* message);
   int32 AddSender(CastTransportSenderIPC* sender);
   void RemoveSender(int32 channel_id);
 
   // IPC::MessageFilter implementation
   bool OnMessageReceived(const IPC::Message& message) override;
   void OnFilterAdded(IPC::Sender* sender) override;
   void OnFilterRemoved() override;
@@ skipping 19 matching lines @@
   void OnRtcpCastMessage(int32 channel_id,
                          uint32 ssrc,
                          const media::cast::RtcpCastMessage& cast_message);
   void OnReceivedPacket(int32 channel_id, const media::cast::Packet& packet);
 
   static CastIPCDispatcher* global_instance_;
 
   // For IPC Send(); must only be accesed on |io_message_loop_|.
   IPC::Sender* sender_;
 
-  // Message loop on which IPC calls are driven.
-  const scoped_refptr<base::MessageLoopProxy> io_message_loop_;
+  // Task runner on which IPC calls are driven.
+  const scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
 
   // A map of stream ids to delegates; must only be accessed on
   // |io_message_loop_|.
   IDMap<CastTransportSenderIPC> id_map_;
   DISALLOW_COPY_AND_ASSIGN(CastIPCDispatcher);
 };
 
 #endif  // CHROME_RENDERER_MEDIA_CAST_IPC_DISPATCHER_H_