Remove calls to deprecated MessageLoop methods in media.

media/midi/midi_manager_mac.cc

 // Copyright (c) 2013 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 "media/midi/midi_manager_mac.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/sys_string_conversions.h"
 
 #include <CoreAudio/HostTime.h>
 #include <stddef.h>
 
 using base::IntToString;
 using base::SysCFStringRefToUTF8;
 using std::string;
 
@@ skipping 124 matching lines @@
                  base::Unretained(this), client, port_index, data, timestamp));
 }
 
 void MidiManagerMac::RunOnClientThread(const base::Closure& closure) {
   if (shutdown_)
     return;
 
   if (!client_thread_.IsRunning())
     client_thread_.Start();
 
-  client_thread_.message_loop()->PostTask(FROM_HERE, closure);
+  client_thread_.task_runner()->PostTask(FROM_HERE, closure);
 }
 
 void MidiManagerMac::InitializeCoreMIDI() {
   DCHECK(client_thread_.task_runner()->BelongsToCurrentThread());
 
   // CoreMIDI registration.
   DCHECK_EQ(0u, midi_client_);
   OSStatus result =
       MIDIClientCreate(CFSTR("Chrome"), ReceiveMidiNotifyDispatch, this,
                        &midi_client_);
@@ skipping 214 matching lines @@
     DCHECK(midi_packet);
 
     MIDISend(coremidi_output_, destination, packet_list);
   }
 
   AccumulateMidiBytesSent(client, data.size());
 }
 
 }  // namespace midi
 }  // namespace media