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

third_party/WebKit/Source/core/page/ChromeClient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple, Inc. All rights
  * reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 229 matching lines @@
   // one. Otherwise it sets it for the WebViewImpl.
   virtual void attachRootLayer(WebLayer*, LocalFrame* localRoot) = 0;
 
   virtual void attachCompositorAnimationTimeline(CompositorAnimationTimeline*,
                                                  LocalFrame* localRoot) {}
   virtual void detachCompositorAnimationTimeline(CompositorAnimationTimeline*,
                                                  LocalFrame* localRoot) {}
 
   virtual void enterFullscreen(LocalFrame&) {}
   virtual void exitFullscreen(LocalFrame&) {}
-  virtual void fullscreenElementChanged(Element*, Element*) {}
+  virtual void fullscreenElementChanged(Element* fromElement,
+                                        Element* toElement) {}
 
   virtual void clearCompositedSelection(LocalFrame*) {}
   virtual void updateCompositedSelection(LocalFrame*,
                                          const CompositedSelection&) {}
 
   virtual void setEventListenerProperties(WebEventListenerClass,
                                           WebEventListenerProperties) = 0;
   virtual WebEventListenerProperties eventListenerProperties(
       WebEventListenerClass) const = 0;
   virtual void setHasScrollEventHandlers(bool) = 0;
@@ skipping 98 matching lines @@
 
   LayoutPoint m_lastToolTipPoint;
   String m_lastToolTipText;
 
   FRIEND_TEST_ALL_PREFIXES(ChromeClientTest, SetToolTipFlood);
 };
 
 }  // namespace blink
 
 #endif  // ChromeClient_h