Don't show media controls when there is a persistent video.

third_party/WebKit/Source/core/frame/SettingsDelegate.h

 /*
  * 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 45 matching lines @@
     ViewportRuleChange,
     DNSPrefetchingChange,
     ImageLoadingChange,
     TextAutosizingChange,
     FontFamilyChange,
     AcceleratedCompositingChange,
     MediaQueryChange,
     AccessibilityStateChange,
     TextTrackKindUserPreferenceChange,
     DOMWorldsChange,
+    MediaControlsChange,
   };
 
   virtual void settingsChanged(ChangeType) = 0;
 
  protected:
   std::unique_ptr<Settings> const m_settings;
 };
 
 }  // namespace blink
 
 #endif  // SettingsDelegate_h