Introduce toHTMLMapElement

Source/core/dom/TreeScope.cpp

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 187 matching lines @@
 
 HTMLMapElement* TreeScope::getImageMap(const String& url) const
 {
     if (url.isNull())
         return 0;
     if (!m_imageMapsByName)
         return 0;
     size_t hashPos = url.find('#');
     String name = (hashPos == notFound ? url : url.substring(hashPos + 1)).impl();
     if (rootNode()->document()->isHTMLDocument())
-        return static_cast<HTMLMapElement*>(m_imageMapsByName->getElementByLowercasedMapName(AtomicString(name.lower()).impl(), this));
-    return static_cast<HTMLMapElement*>(m_imageMapsByName->getElementByMapName(AtomicString(name).impl(), this));
+        return toHTMLMapElement(m_imageMapsByName->getElementByLowercasedMapName(AtomicString(name.lower()).impl(), this));
+    return toHTMLMapElement(m_imageMapsByName->getElementByMapName(AtomicString(name).impl(), this));
 }
 
 Node* nodeFromPoint(Document* document, int x, int y, LayoutPoint* localPoint)
 {
     Frame* frame = document->frame();
 
     if (!frame)
         return 0;
     FrameView* frameView = frame->view();
     if (!frameView)
@@ skipping 286 matching lines @@
             result = element;
         for (ShadowRoot* shadowRoot = element->youngestShadowRoot(); shadowRoot; shadowRoot = shadowRoot->olderShadowRoot()) {
             if (Element* shadowResult = shadowRoot->getElementByAccessKey(key))
                 result = shadowResult;
         }
     }
     return result;
 }
 
 } // namespace WebCore