Remove AtomicStringImpl.

Source/core/editing/MarkupAccumulator.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 21 matching lines @@
 #include "wtf/text/StringBuilder.h"
 
 namespace WebCore {
 
 class Attribute;
 class DocumentType;
 class Element;
 class Node;
 class Range;
 
-typedef HashMap<AtomicStringImpl*, AtomicStringImpl*> Namespaces;
+typedef HashMap<StringImpl*, StringImpl*> Namespaces;
 
 enum EntityMask {
     EntityAmp = 0x0001,
     EntityLt = 0x0002,
     EntityGt = 0x0004,
     EntityQuot = 0x0008,
     EntityNbsp = 0x0010,
 
     // Non-breaking space needs to be escaped in innerHTML for compatibility reason. See http://trac.webkit.org/changeset/32879
     // However, we cannot do this in a XML document because it does not have the entity reference defined (See the bug 19215).
@@ skipping 59 matching lines @@
     void appendQuotedURLAttributeValue(StringBuilder&, const Element*, const Attribute&);
     void serializeNodesWithNamespaces(Node* targetNode, EChildrenOnly, const Namespaces*, Vector<QualifiedName>* tagNamesToSkip);
 
     StringBuilder m_markup;
     const EAbsoluteURLs m_resolveURLsMethod;
 };
 
 }
 
 #endif