Make sure getAttribute() / setAttribute() callers use AtomicStrings

Source/core/html/HTMLTableColElement.h

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 19 matching lines @@
 
 namespace WebCore {
 
 class HTMLTableColElement FINAL : public HTMLTablePartElement {
 public:
     static PassRefPtr<HTMLTableColElement> create(const QualifiedName& tagName, Document&);
 
     int span() const { return m_span; }
     void setSpan(int);
 
-    String width() const;
+    const AtomicString& width() const;
 
 private:
     HTMLTableColElement(const QualifiedName& tagName, Document&);
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual bool isPresentationAttribute(const QualifiedName&) const OVERRIDE;
     virtual void collectStyleForPresentationAttribute(const QualifiedName&, const AtomicString&, MutableStylePropertySet*) OVERRIDE;
     virtual const StylePropertySet* additionalPresentationAttributeStyle() OVERRIDE;
 
     int m_span;
 };
 
 inline bool isHTMLTableColElement(const Node& node)
 {
     return node.hasTagName(HTMLNames::colTag) || node.hasTagName(HTMLNames::colgroupTag);
 }
 
 DEFINE_NODE_TYPE_CASTS_WITH_FUNCTION(HTMLTableColElement);
 
 } // namespace WebCore
 
 #endif