Remove MediaStream runtime flag (status=stable) for blink

Source/web/WebRuntimeFeatures.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 132 matching lines @@
 void WebRuntimeFeatures::enableMediaCapture(bool enable)
 {
     RuntimeEnabledFeatures::setMediaCaptureEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableMediaSource(bool enable)
 {
     RuntimeEnabledFeatures::setMediaSourceEnabled(enable);
 }
 
-void WebRuntimeFeatures::enableMediaStream(bool enable)
-{
-    RuntimeEnabledFeatures::setMediaStreamEnabled(enable);
-}
-
 void WebRuntimeFeatures::enableNotifications(bool enable)
 {
     RuntimeEnabledFeatures::setNotificationsEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableNavigatorContentUtils(bool enable)
 {
     RuntimeEnabledFeatures::setNavigatorContentUtilsEnabled(enable);
 }
 
@@ skipping 116 matching lines @@
 {
     RuntimeEnabledFeatures::setCredentialManagerEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableTextBlobs(bool enable)
 {
     RuntimeEnabledFeatures::setTextBlobEnabled(enable);
 }
 
 } // namespace blink