Form validation: Validation bubble should be closed on document unload process.

third_party/WebKit/Source/core/page/Page.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 136 matching lines @@
   Frame* mainFrame() const { return m_mainFrame; }
   // Escape hatch for existing code that assumes that the root frame is
   // always a LocalFrame. With OOPI, this is not always the case. Code that
   // depends on this will generally have to be rewritten to propagate any
   // necessary state through all renderer processes for that page and/or
   // coordinate/rely on the browser process to help dispatch/coordinate work.
   LocalFrame* deprecatedLocalMainFrame() const {
     return toLocalFrame(m_mainFrame);
   }
 
+  void willUnloadDocument(const Document&);
   void documentDetached(Document*);
 
   bool openedByDOM() const;
   void setOpenedByDOM();
 
   PageAnimator& animator() { return *m_animator; }
   ChromeClient& chromeClient() const { return *m_chromeClient; }
   AutoscrollController& autoscrollController() const {
     return *m_autoscrollController;
   }
@@ skipping 197 matching lines @@
   // Page.
   // FIXME: Most of the members of Page should move onto FrameHost.
   Member<FrameHost> m_frameHost;
 };
 
 extern template class CORE_EXTERN_TEMPLATE_EXPORT Supplement<Page>;
 
 }  // namespace blink
 
 #endif  // Page_h