Fix update of validity cache value, so that it reflects the correct state of any FormControlElement.

Source/core/html/HTMLTextAreaElement.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, 2008, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 302 matching lines @@
     if (maxLength > 0 && U16_IS_LEAD(proposedValue[maxLength - 1]))
         --maxLength;
     return proposedValue.left(maxLength);
 }
 
 void HTMLTextAreaElement::updateValue() const
 {
     if (m_valueIsUpToDate)
         return;
 
-    ASSERT(renderer());
     m_value = innerEditorValue();
     const_cast<HTMLTextAreaElement*>(this)->m_valueIsUpToDate = true;
     const_cast<HTMLTextAreaElement*>(this)->notifyFormStateChanged();
     m_isDirty = true;
     const_cast<HTMLTextAreaElement*>(this)->updatePlaceholderVisibility(false);
 }
 
 String HTMLTextAreaElement::value() const
 {
     updateValue();
@@ skipping 232 matching lines @@
 {
     return true;
 }
 
 bool HTMLTextAreaElement::supportsAutofocus() const
 {
     return true;
 }
 
 }