Remove support for old getUserMedia video constraints algorithm.

content/renderer/media/mock_media_stream_registry.cc

Index: content/renderer/media/mock_media_stream_registry.cc
diff --git a/content/renderer/media/mock_media_stream_registry.cc b/content/renderer/media/mock_media_stream_registry.cc
index c775e7cfd5641d2a4ace95dd0c89dc6a9e3f6476..7f10526e3582271346a67372b3e6e2e9841e526f 100644
--- a/content/renderer/media/mock_media_stream_registry.cc
+++ b/content/renderer/media/mock_media_stream_registry.cc
@@ -56,34 +56,12 @@ void MockMediaStreamRegistry::Init(const std::string& stream_url) {
   test_stream_.SetExtraData(new MediaStream());
 }
 
-void MockMediaStreamRegistry::AddVideoTrack(
-    const std::string& track_id,
-    const blink::WebMediaConstraints& constraints) {
-  DCHECK(IsOldVideoConstraints());
-  blink::WebMediaStreamSource blink_source;
-  blink_source.Initialize("mock video source id",
-                          blink::WebMediaStreamSource::kTypeVideo,
-                          "mock video source name", false /* remote */);
-  MockMediaStreamVideoSource* native_source =
-      new MockMediaStreamVideoSource(false /* manual get supported formats */);
-  blink_source.SetExtraData(native_source);
-  blink::WebMediaStreamTrack blink_track;
-  blink_track.Initialize(blink::WebString::FromUTF8(track_id), blink_source);
-
-  MediaStreamVideoTrack* native_track = new MediaStreamVideoTrack(
-      native_source, constraints, MediaStreamVideoSource::ConstraintsCallback(),
-      true /* enabled */);
-  blink_track.SetTrackData(native_track);
-  test_stream_.AddTrack(blink_track);
-}
-
 void MockMediaStreamRegistry::AddVideoTrack(
     const std::string& track_id,
     const VideoTrackAdapterSettings& adapter_settings,
     const base::Optional<bool>& noise_reduction,
     bool is_screencast,
     double min_frame_rate) {
-  DCHECK(!IsOldVideoConstraints());
   blink::WebMediaStreamSource blink_source;
   blink_source.Initialize("mock video source id",
                           blink::WebMediaStreamSource::kTypeVideo,
@@ -103,14 +81,8 @@ void MockMediaStreamRegistry::AddVideoTrack(
 }
 
 void MockMediaStreamRegistry::AddVideoTrack(const std::string& track_id) {
-  if (IsOldVideoConstraints()) {
-    blink::WebMediaConstraints constraints;
-    constraints.Initialize();
-    AddVideoTrack(track_id, constraints);
-  } else {
-    AddVideoTrack(track_id, VideoTrackAdapterSettings(), base::Optional<bool>(),
-                  false /* is_screncast */, 0.0 /* min_frame_rate */);
-  }
+  AddVideoTrack(track_id, VideoTrackAdapterSettings(), base::Optional<bool>(),
+                false /* is_screncast */, 0.0 /* min_frame_rate */);
 }
 
 void MockMediaStreamRegistry::AddAudioTrack(const std::string& track_id) {