Use AtomicString API directly

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 424 matching lines @@
 
     insertBefore(document().createTextNode(value), firstChild(), IGNORE_EXCEPTION);
 
     if (!m_isDirty)
         setNonDirtyValue(value);
 }
 
 int HTMLTextAreaElement::maxLength() const
 {
     bool ok;
-    int value = getAttribute(maxlengthAttr).string().toInt(&ok);
+    int value = getAttribute(maxlengthAttr).toInt(&ok);
     return ok && value >= 0 ? value : -1;
 }
 
 void HTMLTextAreaElement::setMaxLength(int newValue, ExceptionState& exceptionState)
 {
     if (newValue < 0)
         exceptionState.throwDOMException(IndexSizeError, "The value provided (" + String::number(newValue) + ") is not positive or 0.");
     else
         setIntegralAttribute(maxlengthAttr, newValue);
 }
@@ skipping 108 matching lines @@
 {
     return true;
 }
 
 bool HTMLTextAreaElement::supportsAutofocus() const
 {
     return true;
 }
 
 }