Revert of Sync requestFullscreen() and exitFullscreen() algorithms with the spec

third_party/WebKit/Source/web/ChromeClientImpl.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * 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.
@@ skipping 145 matching lines @@
 
   void attachRootLayer(WebLayer*, LocalFrame* localRoot) override;
 
   void attachCompositorAnimationTimeline(CompositorAnimationTimeline*,
                                          LocalFrame*) override;
   void detachCompositorAnimationTimeline(CompositorAnimationTimeline*,
                                          LocalFrame*) override;
 
   void enterFullscreen(LocalFrame&) override;
   void exitFullscreen(LocalFrame&) override;
-  void fullscreenElementChanged(Element* fromElement,
-                                Element* toElement) override;
+  void fullscreenElementChanged(Element*, Element*) override;
 
   void clearCompositedSelection(LocalFrame*) override;
   void updateCompositedSelection(LocalFrame*,
                                  const CompositedSelection&) override;
 
   // ChromeClient methods:
   void postAccessibilityNotification(AXObject*,
                                      AXObjectCache::AXNotification) override;
   String acceptLanguages() override;
 
@@ skipping 70 matching lines @@
 
 DEFINE_TYPE_CASTS(ChromeClientImpl,
                   ChromeClient,
                   client,
                   client->isChromeClientImpl(),
                   client.isChromeClientImpl());
 
 }  // namespace blink
 
 #endif