Let getSettings() return the constrained track resolution, not source.

content/renderer/media/media_stream_video_track.cc

Index: content/renderer/media/media_stream_video_track.cc
diff --git a/content/renderer/media/media_stream_video_track.cc b/content/renderer/media/media_stream_video_track.cc
index 599018f61e8dfd86409a9eb3807ab884c6ccd47c..0f366f5a77148c6e7c022386f72503cfae3a7800 100644
--- a/content/renderer/media/media_stream_video_track.cc
+++ b/content/renderer/media/media_stream_video_track.cc
@@ -302,18 +302,15 @@ void MediaStreamVideoTrack::Stop() {
 
 void MediaStreamVideoTrack::getSettings(
     blink::WebMediaStreamTrack::Settings& settings) {
-  // TODO(hta): Extract the real value.
-  settings.deviceId = blink::WebString("video device ID");
-  if (!source_)
-    return;
-
   const media::VideoCaptureFormat* format = source_->GetCurrentFormat();
   if (format) {
     settings.frameRate = format->frame_rate;
-    settings.width = format->frame_size.width();
-    settings.height = format->frame_size.height();
     settings.videoKind = GetVideoKindForFormat(*format);
   }
+  if (width_ && height_) {
+    settings.width = width_;
+    settings.height = height_;
+  }
   switch (source_->device_info().device.video_facing) {
     case media::MEDIA_VIDEO_FACING_NONE:
       settings.facingMode = blink::WebMediaStreamTrack::FacingMode::None;