Add more files to content_unittests.

content/content_browser.gypi

 # Copyright (c) 2011 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.
 
 {
   'targets': [
     {
       'target_name': 'content_browser',
       'type': 'static_library',
       'dependencies': [
@@ skipping 326 matching lines @@
         'browser/renderer_host/media/audio_sync_reader.h',
         'browser/renderer_host/media/media_stream_device_settings.cc',
         'browser/renderer_host/media/media_stream_device_settings.h',
         'browser/renderer_host/media/media_stream_dispatcher_host.cc',
         'browser/renderer_host/media/media_stream_dispatcher_host.h',
         'browser/renderer_host/media/media_stream_manager.cc',
         'browser/renderer_host/media/media_stream_manager.h',
         'browser/renderer_host/media/media_stream_provider.h',
         'browser/renderer_host/media/media_stream_requester.h',
         'browser/renderer_host/media/media_stream_settings_requester.h',
-        'browser/renderer_host/media/mock_media_observer.h',
         'browser/renderer_host/media/video_capture_controller.cc',
         'browser/renderer_host/media/video_capture_controller.h',
         'browser/renderer_host/media/video_capture_controller_event_handler.cc',
         'browser/renderer_host/media/video_capture_controller_event_handler.h',
         'browser/renderer_host/media/video_capture_host.cc',
         'browser/renderer_host/media/video_capture_host.h',
         'browser/renderer_host/media/video_capture_manager.cc',
         'browser/renderer_host/media/video_capture_manager.h',
         'browser/renderer_host/pepper_file_message_filter.cc',
         'browser/renderer_host/pepper_file_message_filter.h',
@@ skipping 205 matching lines @@
           },
         }, { # OS!="mac"
           'dependencies': [
             '../sandbox/sandbox.gyp:sandbox',
           ],
         }],
       ],
     },
   ],
 }