Use enum instead of string in MessageLoopFactory::GetMessageLoop*

media/tools/player_x11/player_x11.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 <signal.h>
 
 #include <iostream>  // NOLINT
 
 #include "base/at_exit.h"
 #include "base/bind.h"
@@ skipping 100 matching lines @@
     return false;
   }
 
   // Create our filter factories.
   scoped_ptr<media::FilterCollection> collection(
       new media::FilterCollection());
   collection->SetDemuxer(new media::FFmpegDemuxer(message_loop, data_source));
   collection->AddAudioDecoder(new media::FFmpegAudioDecoder(
       base::Bind(&media::MessageLoopFactory::GetMessageLoop,
                  base::Unretained(message_loop_factory),
-                 "AudioDecoderThread")));
+                 media::MessageLoopFactory::AUDIO_DECODER)));
   collection->AddVideoDecoder(new media::FFmpegVideoDecoder(
       base::Bind(&media::MessageLoopFactory::GetMessageLoop,
                  base::Unretained(message_loop_factory),
-                 "VideoDecoderThread"),
+                 media::MessageLoopFactory::VIDEO_DECODER),
       NULL));
 
   // Create our video renderer and save a reference to it for painting.
   g_video_renderer = new media::VideoRendererBase(
       base::Bind(&Paint, paint_message_loop, paint_cb),
       base::Bind(&SetOpaque),
       true);
   collection->AddVideoRenderer(g_video_renderer);
 
   collection->AddAudioRenderer(
@@ skipping 168 matching lines @@
   // Release callback which releases video renderer. Do this before cleaning up
   // X below since the video renderer has some X cleanup duties as well.
   paint_cb.Reset();
 
   XDestroyWindow(g_display, g_window);
   XCloseDisplay(g_display);
   g_audio_manager = NULL;
 
   return 0;
 }