Remove AudioBuffersState class.

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 73 matching lines @@
         'audio/alsa/audio_manager_alsa.h',
         'audio/android/audio_manager_android.cc',
         'audio/android/audio_manager_android.h',
         'audio/android/audio_record_input.cc',
         'audio/android/audio_record_input.h',
         'audio/android/opensles_input.cc',
         'audio/android/opensles_input.h',
         'audio/android/opensles_output.cc',
         'audio/android/opensles_output.h',
         'audio/android/opensles_wrapper.cc',
-        'audio/audio_buffers_state.cc',
-        'audio/audio_buffers_state.h',
         'audio/audio_device_name.cc',
         'audio/audio_device_name.h',
         'audio/audio_device_thread.cc',
         'audio/audio_device_thread.h',
         'audio/audio_input_controller.cc',
         'audio/audio_input_controller.h',
         'audio/audio_input_device.cc',
         'audio/audio_input_device.h',
         'audio/audio_input_ipc.cc',
         'audio/audio_input_ipc.h',
@@ skipping 1639 matching lines @@
                   ],
                 }],
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }