Add number() static methods to AtomicString class

Source/core/html/HTMLImageElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 291 matching lines @@
 }
 
 bool HTMLImageElement::draggable() const
 {
     // Image elements are draggable by default.
     return !equalIgnoringCase(getAttribute(draggableAttr), "false");
 }
 
 void HTMLImageElement::setHeight(int value)
 {
-    setAttribute(heightAttr, String::number(value));
+    setIntegralAttribute(heightAttr, value);
 }
 
 KURL HTMLImageElement::src() const
 {
     return document().completeURL(getAttribute(srcAttr));
 }
 
 void HTMLImageElement::setSrc(const String& value)
 {
     setAttribute(srcAttr, value);
 }
 
 void HTMLImageElement::setWidth(int value)
 {
-    setAttribute(widthAttr, String::number(value));
+    setIntegralAttribute(widthAttr, value);
 }
 
 int HTMLImageElement::x() const
 {
     RenderObject* r = renderer();
     if (!r)
         return 0;
 
     // FIXME: This doesn't work correctly with transforms.
     FloatPoint absPos = r->localToAbsolute();
@@ skipping 52 matching lines @@
 
     return m_imageLoader.image()->image();
 }
 
 bool HTMLImageElement::isInteractiveContent() const
 {
     return fastHasAttribute(usemapAttr);
 }
 
 }