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

third_party/WebKit/Source/core/dom/Document.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, 2011, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
@@ skipping 3060 matching lines @@
 
 void Document::dispatchUnloadEvents() {
   PluginScriptForbiddenScope forbidPluginDestructorScripting;
   if (m_parser)
     m_parser->stopParsing();
 
   if (m_loadEventProgress == LoadEventNotRun)
     return;
 
   if (m_loadEventProgress <= UnloadEventInProgress) {
+    if (page())
+      page()->willUnloadDocument(*this);
     Element* currentFocusedElement = focusedElement();
     if (isHTMLInputElement(currentFocusedElement))
       toHTMLInputElement(*currentFocusedElement).endEditing();
     if (m_loadEventProgress < PageHideInProgress) {
       m_loadEventProgress = PageHideInProgress;
       if (LocalDOMWindow* window = domWindow())
         window->dispatchEvent(
             PageTransitionEvent::create(EventTypeNames::pagehide, false), this);
       if (!m_frame)
         return;
@@ skipping 3565 matching lines @@
 }
 
 void showLiveDocumentInstances() {
   WeakDocumentSet& set = liveDocumentSet();
   fprintf(stderr, "There are %u documents currently alive:\n", set.size());
   for (blink::Document* document : set)
     fprintf(stderr, "- Document %p URL: %s\n", document,
             document->url().getString().utf8().data());
 }
 #endif