Remove newMediaPlaybackUi flag from content/ and Blink.

third_party/WebKit/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 274 matching lines @@
 }
 
 void WebRuntimeFeatures::enableUnsafeES3APIs(bool enable) {
   RuntimeEnabledFeatures::setUnsafeES3APIsEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableWebVR(bool enable) {
   RuntimeEnabledFeatures::setWebVREnabled(enable);
 }
 
-void WebRuntimeFeatures::enableNewMediaPlaybackUi(bool enable) {
-  RuntimeEnabledFeatures::setNewMediaPlaybackUiEnabled(enable);
-}
-
 void WebRuntimeFeatures::enablePresentationAPI(bool enable) {
   RuntimeEnabledFeatures::setPresentationEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableWebFontsInterventionV2With2G(bool enable) {
   RuntimeEnabledFeatures::setWebFontsInterventionV2With2GEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableWebFontsInterventionV2With3G(bool enable) {
   RuntimeEnabledFeatures::setWebFontsInterventionV2With3GEnabled(enable);
@@ skipping 39 matching lines @@
   RuntimeEnabledFeatures::setTimerThrottlingForHiddenFramesEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableSendBeaconThrowForBlobWithNonSimpleType(
     bool enable) {
   RuntimeEnabledFeatures::setSendBeaconThrowForBlobWithNonSimpleTypeEnabled(
       enable);
 }
 
 }  // namespace blink