Remove dead code related to MediaStreamSource constraints.

MediaStreamSources do not have constraints, so remove old accessors
that provided that functionality.

Bug: 877430
Change-Id: Iee3973f5ddcb8d85608a798565784a59e474231a
Reviewed-on: https://chromium-review.googlesource.com/1188312Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585829}

third_party/blink/public/platform/web_media_stream_source.h

@@ -44,7 +44,6 @@ namespace blink {
 
 class MediaStreamSource;
 class WebAudioDestinationConsumer;
-class WebMediaConstraints;
 class WebString;
 
 class WebMediaStreamSource {
@@ -138,8 +137,6 @@ class WebMediaStreamSource {
       bool auto_gain_control,
       bool noise_supression);
 
-  BLINK_PLATFORM_EXPORT WebMediaConstraints Constraints();
-
   BLINK_PLATFORM_EXPORT void SetCapabilities(const Capabilities&);
 
   // Only used if if this is a WebAudio source.

third_party/blink/renderer/modules/mediastream/user_media_request.cc

@@ -550,14 +550,12 @@ void UserMediaRequest::Succeed(MediaStreamDescriptor* stream_descriptor) {
   MediaStreamTrackVector audio_tracks = stream->getAudioTracks();
   for (MediaStreamTrackVector::iterator iter = audio_tracks.begin();
        iter != audio_tracks.end(); ++iter) {
-    (*iter)->Component()->Source()->SetConstraints(audio_);
     (*iter)->SetConstraints(audio_);
   }
 
   MediaStreamTrackVector video_tracks = stream->getVideoTracks();
   for (MediaStreamTrackVector::iterator iter = video_tracks.begin();
        iter != video_tracks.end(); ++iter) {
-    (*iter)->Component()->Source()->SetConstraints(video_);
     (*iter)->SetConstraints(video_);
   }
 

third_party/blink/renderer/platform/exported/web_media_stream_source.cc

@@ -177,11 +177,6 @@ void WebMediaStreamSource::SetAudioProcessingProperties(
       auto_gain_control, noise_supression);
 }
 
-WebMediaConstraints WebMediaStreamSource::Constraints() {
-  DCHECK(!private_.IsNull());
-  return private_->Constraints();
-}
-
 void WebMediaStreamSource::SetCapabilities(
     const WebMediaStreamSource::Capabilities& capabilities) {
   DCHECK(!private_.IsNull());

third_party/blink/renderer/platform/mediastream/media_stream_source.h

@@ -103,10 +103,6 @@ class PLATFORM_EXPORT MediaStreamSource final
                                     bool auto_gain_control,
                                     bool noise_supression);
 
-  void SetConstraints(WebMediaConstraints constraints) {
-    constraints_ = constraints;
-  }
-  WebMediaConstraints Constraints() { return constraints_; }
   void GetSettings(WebMediaStreamTrack::Settings&);
 
   const WebMediaStreamSource::Capabilities& GetCapabilities() {