Fix crash with fullscreen elements inside frames.

Source/web/FullscreenController.h

 /*
  * 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 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef FullscreenController_h
 #define FullscreenController_h
 
+#include "core/rendering/RenderFullScreen.h"
 #include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/heap/Handle.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class Element;
 class LocalFrame;
 class WebViewImpl;
 
 class FullscreenController final : public NoBaseWillBeGarbageCollected<FullscreenController> {
 public:
     static PassOwnPtrWillBeRawPtr<FullscreenController> create(WebViewImpl*);
 
     void didEnterFullScreen();
     void didExitFullScreen();
 
     void enterFullScreenForElement(Element*);
     void exitFullScreenForElement(Element*);
 
     bool isFullscreen() { return m_fullScreenFrame; }
 
+    void updateSize();
+
     void trace(Visitor*);
 
 protected:
     explicit FullscreenController(WebViewImpl*);
 
 private:
     WebViewImpl* m_webViewImpl;
 
     float m_exitFullscreenPageScaleFactor;
     IntSize m_exitFullscreenScrollOffset;
     FloatPoint m_exitFullscreenPinchViewportOffset;
 
     // If set, the WebView is transitioning to fullscreen for this element.
     RefPtrWillBeMember<Element> m_provisionalFullScreenElement;
 
     // If set, the WebView is in fullscreen mode for an element in this frame.
     RefPtrWillBeMember<LocalFrame> m_fullScreenFrame;
 
     bool m_isCancelingFullScreen;
 };
 
 } // namespace blink
 
 #endif