Make Fullscreen::fullyExitFullscreen() static

Source/web/WebDocument.cpp

 /*
  * Copyright (C) 2009 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 209 matching lines @@
 void WebDocument::watchCSSSelectors(const WebVector<WebString>& webSelectors)
 {
     RefPtrWillBeRawPtr<Document> document = unwrap<Document>();
     Vector<String> selectors;
     selectors.append(webSelectors.data(), webSelectors.size());
     CSSSelectorWatch::from(*document).watchCSSSelectors(selectors);
 }
 
 void WebDocument::cancelFullScreen()
 {
-    if (Fullscreen* fullscreen = Fullscreen::fromIfExists(*unwrap<Document>()))
-        fullscreen->fullyExitFullscreen();
+    Fullscreen::fullyExitFullscreen(*unwrap<Document>());
 }
 
 WebElement WebDocument::fullScreenElement() const
 {
     Element* fullScreenElement = 0;
     if (Fullscreen* fullscreen = Fullscreen::fromIfExists(*const_cast<WebDocument*>(this)->unwrap<Document>()))
         fullScreenElement = fullscreen->webkitCurrentFullScreenElement();
     return WebElement(fullScreenElement);
 }
 
@@ skipping 84 matching lines @@
     m_private = elem;
     return *this;
 }
 
 WebDocument::operator PassRefPtrWillBeRawPtr<Document>() const
 {
     return toDocument(m_private.get());
 }
 
 } // namespace blink