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

third_party/WebKit/Source/web/WebViewImpl.h

 /*
  * Copyright (C) 2010 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 430 matching lines @@
   }
   float fakePageScaleAnimationPageScaleForTesting() const {
     return m_fakePageScaleAnimationPageScaleFactor;
   }
   bool fakePageScaleAnimationUseAnchorForTesting() const {
     return m_fakePageScaleAnimationUseAnchor;
   }
 
   void enterFullscreen(LocalFrame&);
   void exitFullscreen(LocalFrame&);
-  void fullscreenElementChanged(Element*, Element*);
+  void fullscreenElementChanged(Element* fromElement, Element* toElement);
 
   // Exposed for the purpose of overriding device metrics.
   void sendResizeEventAndRepaint();
 
   // Exposed for testing purposes.
   bool hasHorizontalScrollbar();
   bool hasVerticalScrollbar();
 
   // Exposed for tests.
   unsigned numLinkHighlights() { return m_linkHighlights.size(); }
@@ skipping 279 matching lines @@
   Persistent<ResizeViewportAnchor> m_resizeViewportAnchor;
 };
 
 // We have no ways to check if the specified WebView is an instance of
 // WebViewImpl because WebViewImpl is the only implementation of WebView.
 DEFINE_TYPE_CASTS(WebViewImpl, WebView, webView, true, true);
 
 }  // namespace blink
 
 #endif