Replace MessageLoopProxy with SingleThreadTaskRunner for the rest of media/.

media/media.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
     # Override to dynamically link the cras (ChromeOS audio) library.
     'use_cras%': 0,
     # Option e.g. for Linux distributions to link pulseaudio directly
@@ skipping 143 matching lines @@
         'audio/pulse/pulse_input.cc',
         'audio/pulse/pulse_input.h',
         'audio/pulse/pulse_output.cc',
         'audio/pulse/pulse_output.h',
         'audio/pulse/pulse_unified.cc',
         'audio/pulse/pulse_unified.h',
         'audio/pulse/pulse_util.cc',
         'audio/pulse/pulse_util.h',
         'audio/sample_rates.cc',
         'audio/sample_rates.h',
-        'audio/scoped_loop_observer.cc',
-        'audio/scoped_loop_observer.h',
+        'audio/scoped_task_runner_observer.cc',
+        'audio/scoped_task_runner_observer.h',
         'audio/simple_sources.cc',
         'audio/simple_sources.h',
         'audio/sounds/audio_stream_handler.cc',
         'audio/sounds/audio_stream_handler.h',
         'audio/sounds/sounds_manager.cc',
         'audio/sounds/sounds_manager.h',
         'audio/sounds/wav_audio_handler.cc',
         'audio/sounds/wav_audio_handler.h',
         'audio/virtual_audio_input_stream.cc',
         'audio/virtual_audio_input_stream.h',
@@ skipping 1375 matching lines @@
                   ],
                 }],
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }