Remove newMediaPlaybackUi flag from content/ and Blink.

third_party/WebKit/Source/core/testing/Internals.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 354 matching lines @@
 
   bool magnifyScaleAroundAnchor(float factor, float x, float y);
 
   void setIsCursorVisible(Document*, bool, ExceptionState&);
 
   double effectiveMediaVolume(HTMLMediaElement*);
   String effectivePreload(HTMLMediaElement*);
 
   void mediaPlayerRemoteRouteAvailabilityChanged(HTMLMediaElement*, bool);
   void mediaPlayerPlayingRemotelyChanged(HTMLMediaElement*, bool);
-  void setAllowHiddenVolumeControls(HTMLMediaElement*, bool);
 
   void registerURLSchemeAsBypassingContentSecurityPolicy(const String& scheme);
   void registerURLSchemeAsBypassingContentSecurityPolicy(
       const String& scheme,
       const Vector<String>& policyAreas);
   void removeURLSchemeRegisteredAsBypassingContentSecurityPolicy(
       const String& scheme);
 
   TypeConversions* typeConversions() const;
   PrivateScriptTest* privateScriptTest() const;
@@ skipping 156 matching lines @@
                            unsigned index,
                            ExceptionState&);
   Member<InternalRuntimeFlags> m_runtimeFlags;
 
   IterationSource* startIteration(ScriptState*, ExceptionState&) override;
 };
 
 }  // namespace blink
 
 #endif  // Internals_h