Spec compliant video constraints for getUserMedia behind flag.

content/public/renderer/media_stream_utils.cc

 // Copyright 2015 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 "content/public/renderer/media_stream_utils.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/callback.h"
@@ skipping 25 matching lines @@
   blink::WebMediaStreamSource web_media_stream_source;
   MediaStreamVideoSource* const media_stream_source =
       new MediaStreamVideoCapturerSource(
           MediaStreamSource::SourceStoppedCallback(), std::move(video_source));
   const blink::WebString track_id =
       blink::WebString::fromUTF8(base::GenerateGUID());
   web_media_stream_source.initialize(
       track_id, blink::WebMediaStreamSource::TypeVideo, track_id, is_remote);
   // Takes ownership of |media_stream_source|.
   web_media_stream_source.setExtraData(media_stream_source);
-
-  blink::WebMediaConstraints constraints;
-  constraints.initialize();
   web_media_stream->addTrack(MediaStreamVideoTrack::CreateVideoTrack(
-      media_stream_source, constraints,
-      MediaStreamVideoSource::ConstraintsCallback(), true));
+      media_stream_source, MediaStreamVideoSource::ConstraintsCallback(),
+      true));
   return true;
 }
 
 bool AddAudioTrackToMediaStream(
     scoped_refptr<media::AudioCapturerSource> audio_source,
     int sample_rate,
     media::ChannelLayout channel_layout,
     int frames_per_buffer,
     bool is_remote,
     blink::WebMediaStream* web_media_stream) {
@@ skipping 48 matching lines @@
     const blink::WebMediaStreamTrack& video_track) {
   if (video_track.isNull())
     return;
   MediaStreamVideoSource* const source =
       MediaStreamVideoSource::GetVideoSource(video_track.source());
   if (source)
     source->RequestRefreshFrame();
 }
 
 }  // namespace content