Spec compliant video constraints for getUserMedia behind flag.

content/renderer/media/rtc_peer_connection_handler_unittest.cc

Index: content/renderer/media/rtc_peer_connection_handler_unittest.cc
diff --git a/content/renderer/media/rtc_peer_connection_handler_unittest.cc b/content/renderer/media/rtc_peer_connection_handler_unittest.cc
index 880e86a90bca12bcc7f988c391e506635dd4d0b2..12f4df6def696601f28b2e6f86297abe72ffbab9 100644
--- a/content/renderer/media/rtc_peer_connection_handler_unittest.cc
+++ b/content/renderer/media/rtc_peer_connection_handler_unittest.cc
@@ -331,11 +331,9 @@ class RTCPeerConnectionHandlerTest : public ::testing::Test {
     CHECK(audio_source->ConnectToTrack(audio_tracks[0]));
     blink::WebVector<blink::WebMediaStreamTrack> video_tracks(
         static_cast<size_t>(1));
-    blink::WebMediaConstraints video_constraints;
-    video_constraints.initialize();
     video_tracks[0] = MediaStreamVideoTrack::CreateVideoTrack(
-        native_video_source, video_constraints,
-        MediaStreamVideoSource::ConstraintsCallback(), true);
+        native_video_source, MediaStreamVideoSource::ConstraintsCallback(),
+        true);
 
     blink::WebMediaStream local_stream;
     local_stream.initialize(blink::WebString::fromUTF8(stream_label),