Spec compliant video constraints for getUserMedia behind flag.

content/renderer/media/webrtc/webrtc_media_stream_adapter_unittest.cc

 // Copyright 2014 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/renderer/media/webrtc/webrtc_media_stream_adapter.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 63 matching lines @@
     blink::WebVector<blink::WebMediaStreamTrack> video_track_vector(
         video ? static_cast<size_t>(1) : 0);
     MediaStreamSource::SourceStoppedCallback dummy_callback;
     if (video) {
       blink::WebMediaStreamSource video_source;
       video_source.initialize("video", blink::WebMediaStreamSource::TypeVideo,
                               "video", false /* remote */);
       MediaStreamVideoSource* native_source =
           new MockMediaStreamVideoSource(false);
       video_source.setExtraData(native_source);
-      blink::WebMediaConstraints constraints;
-      constraints.initialize();
       video_track_vector[0] = MediaStreamVideoTrack::CreateVideoTrack(
-          native_source, constraints,
-          MediaStreamVideoSource::ConstraintsCallback(), true);
+          native_source, MediaStreamVideoSource::ConstraintsCallback(), true);
     }
 
     blink::WebMediaStream stream_desc;
     stream_desc.initialize("media stream",
                            audio_track_vector,
                            video_track_vector);
     stream_desc.setExtraData(new MediaStream());
     return stream_desc;
   }
 
@@ skipping 74 matching lines @@
   EXPECT_TRUE(webrtc_stream()->GetVideoTracks().empty());
 
   native_stream->AddTrack(audio_tracks[0]);
   EXPECT_EQ(1u, webrtc_stream()->GetAudioTracks().size());
 
   native_stream->AddTrack(video_tracks[0]);
   EXPECT_EQ(1u, webrtc_stream()->GetVideoTracks().size());
 }
 
 }  // namespace content