Make Fullscreen::fullyExitFullscreen() static

Source/core/dom/Fullscreen.cpp

 /*
  * 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 277 matching lines @@
         m_areKeysEnabledInFullScreen = requestType != PrefixedMozillaRequest && requestType != PrefixedVideoRequest;
         document()->frameHost()->chrome().client().enterFullScreenForElement(&element);
 
         // 7. Optionally, display a message indicating how the user can exit displaying the context object fullscreen.
         return;
     } while (0);
 
     enqueueErrorEvent(element, requestType);
 }
 
-void Fullscreen::fullyExitFullscreen()
+void Fullscreen::fullyExitFullscreen(Document& document)
 {
     // To fully exit fullscreen, run these steps:
 
     // 1. Let |doc| be the top-level browsing context's document.
-    Document& doc = document()->topDocument();
+    Document& doc = document.topDocument();
 
     // 2. If |doc|'s fullscreen element stack is empty, terminate these steps.
     if (!fullscreenElementFrom(doc))
         return;
 
     // 3. Remove elements from |doc|'s fullscreen element stack until only the top element is left.
     size_t stackSize = from(doc).m_fullScreenElementStack.size();
     from(doc).m_fullScreenElementStack.remove(0, stackSize - 1);
     ASSERT(from(doc).m_fullScreenElementStack.size() == 1);
 
@@ skipping 300 matching lines @@
 void Fullscreen::trace(Visitor* visitor)
 {
     visitor->trace(m_fullScreenElement);
     visitor->trace(m_fullScreenElementStack);
     visitor->trace(m_fullScreenRenderer);
     visitor->trace(m_eventQueue);
     DocumentSupplement::trace(visitor);
 }
 
 } // namespace blink