Revert of Move navigation-induced hiding of form-validation-bubble to the browser 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 3211 matching lines @@
 
 void Document::DispatchUnloadEvents() {
   PluginScriptForbiddenScope forbid_plugin_destructor_scripting;
   if (parser_)
     parser_->StopParsing();
 
   if (load_event_progress_ == kLoadEventNotRun)
     return;
 
   if (load_event_progress_ <= kUnloadEventInProgress) {
+    if (GetPage())
+      GetPage()->WillUnloadDocument(*this);
     Element* current_focused_element = FocusedElement();
     if (isHTMLInputElement(current_focused_element))
       toHTMLInputElement(*current_focused_element).EndEditing();
     if (load_event_progress_ < kPageHideInProgress) {
       load_event_progress_ = kPageHideInProgress;
       if (LocalDOMWindow* window = domWindow())
         window->DispatchEvent(
             PageTransitionEvent::Create(EventTypeNames::pagehide, false), this);
       if (!frame_)
         return;
@@ skipping 3656 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