Remove webkitIsFullScreen everywhere except in bindings

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 116 matching lines @@
     }
 }
 
 void FullscreenController::didExitFullScreen()
 {
     if (!m_fullScreenFrame)
         return;
 
     if (Document* doc = m_fullScreenFrame->document()) {
         if (Fullscreen* fullscreen = Fullscreen::fromIfExists(*doc)) {
-            if (fullscreen->webkitIsFullScreen()) {
+            if (fullscreen->webkitCurrentFullScreenElement()) {
                 if (m_exitFullscreenPageScaleFactor) {
                     m_webViewImpl->setPageScaleFactor(m_exitFullscreenPageScaleFactor);
                     m_webViewImpl->setMainFrameScrollOffset(IntPoint(m_exitFullscreenScrollOffset));
                     m_webViewImpl->setPinchViewportOffset(m_exitFullscreenPinchViewportOffset);
                     m_exitFullscreenPageScaleFactor = 0;
                     m_exitFullscreenScrollOffset = IntSize();
                 }
 
                 fullscreen->didExitFullScreenForElement(0);
             }
@@ skipping 30 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