Fix build failure with "enable_webrtc = false".

content/content_renderer.gypi

 # 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
     '../cc/cc.gyp:cc',
     '../cc/cc.gyp:cc_proto',
@@ skipping 50 matching lines @@
       'public/renderer/browser_plugin_delegate.cc',
       'public/renderer/browser_plugin_delegate.h',
       'public/renderer/chrome_object_extensions_utils.cc',
       'public/renderer/chrome_object_extensions_utils.h',
       'public/renderer/content_renderer_client.cc',
       'public/renderer/content_renderer_client.h',
       'public/renderer/context_menu_client.h',
       'public/renderer/document_state.cc',
       'public/renderer/document_state.h',
       'public/renderer/media_stream_audio_renderer.h',
-      'public/renderer/media_stream_audio_sink.cc',
-      'public/renderer/media_stream_audio_sink.h',
       'public/renderer/media_stream_sink.h',
       'public/renderer/navigation_state.cc',
       'public/renderer/navigation_state.h',
       'public/renderer/pepper_plugin_instance.h',
       'public/renderer/platform_event_observer.h',
       'public/renderer/render_accessibility.h',
       'public/renderer/render_frame.h',
       'public/renderer/render_frame_observer.cc',
       'public/renderer/render_frame_observer.h',
       'public/renderer/render_frame_observer_tracker.h',
@@ skipping 225 matching lines @@
       'renderer/media/audio_renderer_sink_cache.h',
       'renderer/media/audio_renderer_sink_cache_impl.cc',
       'renderer/media/audio_renderer_sink_cache_impl.h',
       'renderer/media/cdm/pepper_cdm_wrapper.h',
       'renderer/media/cdm/pepper_cdm_wrapper_impl.cc',
       'renderer/media/cdm/pepper_cdm_wrapper_impl.h',
       'renderer/media/cdm/ppapi_decryptor.cc',
       'renderer/media/cdm/ppapi_decryptor.h',
       'renderer/media/cdm/render_cdm_factory.cc',
       'renderer/media/cdm/render_cdm_factory.h',
-      'renderer/media/html_audio_element_capturer_source.cc',
-      'renderer/media/html_audio_element_capturer_source.h',
-      'renderer/media/external_media_stream_audio_source.cc',
-      'renderer/media/external_media_stream_audio_source.h',
-      'renderer/media/local_media_stream_audio_source.cc',
-      'renderer/media/local_media_stream_audio_source.h',
       'renderer/media/media_permission_dispatcher.cc',
       'renderer/media/media_permission_dispatcher.h',
-      'renderer/media/media_stream_audio_deliverer.h',
       'renderer/media/media_stream_audio_level_calculator.cc',
       'renderer/media/media_stream_audio_level_calculator.h',
-      'renderer/media/media_stream_audio_source.cc',
-      'renderer/media/media_stream_audio_source.h',
       'renderer/media/media_stream_audio_track.cc',
       'renderer/media/media_stream_audio_track.h',
       'renderer/media/media_stream_center.h',
       'renderer/media/media_stream_constraints_util.cc',
       'renderer/media/media_stream_constraints_util.h',
       'renderer/media/media_stream_dispatcher.h',
       'renderer/media/media_stream_dispatcher_eventhandler.h',
       'renderer/media/media_stream_source.cc',
       'renderer/media/media_stream_source.h',
       'renderer/media/media_stream_track.cc',
@@ skipping 286 matching lines @@
       'renderer/pepper/v8object_var.cc',
       'renderer/pepper/v8object_var.h',
       'renderer/pepper/video_decoder_shim.cc',
       'renderer/pepper/video_decoder_shim.h',
       'renderer/pepper/video_encoder_shim.cc',
       'renderer/pepper/video_encoder_shim.h',
       'renderer/render_widget_fullscreen_pepper.cc',
       'renderer/render_widget_fullscreen_pepper.h',
     ],
     'public_renderer_webrtc_sources': [
+      'public/renderer/media_stream_audio_sink.cc',
+      'public/renderer/media_stream_audio_sink.h',

[mcasas, 2016/08/29 16:56:38]

Hmm I'm wondering why to single out just these few 
files, and not bundle all media_stream_* files under
these categories -- context: WebRTC grew up to encompass
not just the RTCPeerConnection-supporting classes,
but also all MediaStream and derivatives work (like, e.g.
the html_*_element_capturer_source).

So why not move all said files in the ..._webtrc_sources 
categories?

Also, to better understand why this is done, could you
file a bug?

Don't bother running master.tryserver.webrtc bots, they
won't work (always fail to patch).

[Shouqun1, 2016/08/30 01:12:14]

@mcasas, I have filed a bug to tracking this issue: http://crbug.com/642210
and I'll firstly try to move MediaStream files into webrtc category.

       'public/renderer/media_stream_renderer_factory.h',
       'public/renderer/media_stream_utils.cc',
       'public/renderer/media_stream_utils.h',
       'public/renderer/media_stream_video_sink.cc',
       'public/renderer/media_stream_video_sink.h',
       'public/renderer/webrtc_log_message_delegate.h',
     ],
     # WebRTC-specific sources. Put WebRTC plugin-related stuff in the
     # Plugin+WebRTC section below.
     'private_renderer_webrtc_sources': [
       'renderer/media/audio_repetition_detector.cc',
       'renderer/media/audio_repetition_detector.h',
       'renderer/media/audio_track_recorder.cc',
       'renderer/media/audio_track_recorder.h',
       'renderer/media/canvas_capture_handler.cc',
       'renderer/media/canvas_capture_handler.h',
+      'renderer/media/external_media_stream_audio_source.cc',
+      'renderer/media/external_media_stream_audio_source.h',
       'renderer/media/gpu/rtc_video_decoder.cc',
       'renderer/media/gpu/rtc_video_decoder.h',
       'renderer/media/gpu/rtc_video_decoder_factory.cc',
       'renderer/media/gpu/rtc_video_decoder_factory.h',
       'renderer/media/gpu/rtc_video_encoder.cc',
       'renderer/media/gpu/rtc_video_encoder.h',
       'renderer/media/gpu/rtc_video_encoder_factory.cc',
       'renderer/media/gpu/rtc_video_encoder_factory.h',
+      'renderer/media/html_audio_element_capturer_source.cc',
+      'renderer/media/html_audio_element_capturer_source.h',
       'renderer/media/html_video_element_capturer_source.cc',
       'renderer/media/html_video_element_capturer_source.h',
       'renderer/media/image_capture_frame_grabber.cc',
       'renderer/media/image_capture_frame_grabber.h',
+      'renderer/media/local_media_stream_audio_source.cc',
+      'renderer/media/local_media_stream_audio_source.h',
       'renderer/media/media_recorder_handler.cc',
       'renderer/media/media_recorder_handler.h',
       'renderer/media/media_stream.cc',
       'renderer/media/media_stream.h',
+      'renderer/media/media_stream_audio_deliverer.h',
       'renderer/media/media_stream_audio_processor.cc',
       'renderer/media/media_stream_audio_processor.h',
       'renderer/media/media_stream_audio_processor_options.cc',
       'renderer/media/media_stream_audio_processor_options.h',
+      'renderer/media/media_stream_audio_source.cc',
+      'renderer/media/media_stream_audio_source.h',
       'renderer/media/media_stream_center.cc',
       'renderer/media/media_stream_dispatcher.cc',
       'renderer/media/media_stream_registry_interface.h',
       'renderer/media/media_stream_renderer_factory_impl.cc',
       'renderer/media/media_stream_renderer_factory_impl.h',
       'renderer/media/media_stream_video_capturer_source.cc',
       'renderer/media/media_stream_video_capturer_source.h',
       'renderer/media/media_stream_video_renderer_sink.cc',
       'renderer/media/media_stream_video_renderer_sink.h',
       'renderer/media/media_stream_video_source.cc',
@@ skipping 225 matching lines @@
     }],
   ],
   'target_conditions': [
     ['OS=="android"', {
       'sources/': [
         ['include', '^renderer/render_view_linux\\.cc$'],
       ],
     }],
   ],
 }