Oilpan: Make the Node hierarchy RefCountedGarbageCollected instead of TreeShared.

Source/core/html/HTMLFormControlElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.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
@@ skipping 229 matching lines @@
     m_ancestorDisabledState = AncestorDisabledStateUnknown;
     m_dataListAncestorState = Unknown;
     setNeedsWillValidateCheck();
     HTMLElement::insertedInto(insertionPoint);
     FormAssociatedElement::insertedInto(insertionPoint);
     return InsertionDone;
 }
 
 void HTMLFormControlElement::removedFrom(ContainerNode* insertionPoint)
 {
+    hideVisibleValidationMessage();
     m_validationMessage = nullptr;
     m_ancestorDisabledState = AncestorDisabledStateUnknown;
     m_dataListAncestorState = Unknown;
     HTMLElement::removedFrom(insertionPoint);
     FormAssociatedElement::removedFrom(insertionPoint);
 }
 
 void HTMLFormControlElement::setChangedSinceLastFormControlChangeEvent(bool changed)
 {
     m_wasChangedSinceLastFormControlChangeEvent = changed;
@@ skipping 236 matching lines @@
 
 void HTMLFormControlElement::setFocus(bool flag)
 {
     LabelableElement::setFocus(flag);
 
     if (!flag && wasChangedSinceLastFormControlChangeEvent())
         dispatchFormControlChangeEvent();
 }
 
 } // namespace Webcore