Make Fullscreen::fullyExitFullscreen() static

Source/core/dom/Fullscreen.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
@@ skipping 49 matching lines @@
 
     enum RequestType {
         UnprefixedRequest, // Element.requestFullscreen()
         PrefixedRequest, // Element.webkitRequestFullscreen()
         PrefixedMozillaRequest, // Element.webkitRequestFullScreen()
         PrefixedMozillaAllowKeyboardInputRequest, // Element.webkitRequestFullScreen(Element.ALLOW_KEYBOARD_INPUT)
         PrefixedVideoRequest, // HTMLVideoElement.webkitEnterFullscreen() and webkitEnterFullScreen()
     };
 
     void requestFullscreen(Element&, RequestType);
-    void fullyExitFullscreen();
+    static void fullyExitFullscreen(Document&);
     void exitFullscreen();
 
     static bool fullscreenEnabled(Document&);
     Element* fullscreenElement() const { return !m_fullScreenElementStack.isEmpty() ? m_fullScreenElementStack.last().first.get() : 0; }
 
     void willEnterFullScreenForElement(Element*);
     void didEnterFullScreenForElement(Element*);
     void willExitFullScreenForElement(Element*);
     void didExitFullScreenForElement(Element*);
 
@@ skipping 61 matching lines @@
 // Needed by the HeapVector<> element stack.
 namespace WTF {
 
 template<>struct IsPod<blink::Fullscreen::RequestType> {
     static const bool value = true;
 };
 
 } // namespace WTF
 
 #endif // Fullscreen_h