Make Fullscreen::fullyExitFullscreen() static

Source/web/FullscreenController.cpp

 /*
  * Copyright (C) 2013 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 100 matching lines @@
         return;
 
     if (Document* doc = m_fullScreenFrame->document()) {
         Fullscreen* fullscreen = Fullscreen::fromIfExists(*doc);
         if (!fullscreen)
             return;
         if (fullscreen->isFullScreen(*doc)) {
             // When the client exits from full screen we have to call fullyExitFullscreen to notify
             // the document. While doing that, suppress notifications back to the client.
             m_isCancelingFullScreen = true;
-            fullscreen->fullyExitFullscreen();
+            Fullscreen::fullyExitFullscreen(*doc);
             m_isCancelingFullScreen = false;
             fullscreen->willExitFullScreenForElement(0);
             if (RuntimeEnabledFeatures::overlayFullscreenVideoEnabled() && m_webViewImpl->layerTreeView())
                 m_webViewImpl->layerTreeView()->setHasTransparentBackground(m_webViewImpl->isTransparent());
         }
     }
 }
 
 void FullscreenController::didExitFullScreen()
 {
@@ skipping 46 matching lines @@
 {
     // The client is exiting full screen, so don't send a notification.
     if (m_isCancelingFullScreen)
         return;
     if (WebViewClient* client = m_webViewImpl->client())
         client->exitFullScreen();
 }
 
 } // namespace blink