blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/editing/serializers/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
@@ skipping 19 matching lines @@
 #include "core/editing/EditingStrategy.h"
 #include "core/editing/serializers/MarkupFormatter.h"
 #include "core/editing/serializers/Serialization.h"
 #include "wtf/HashMap.h"
 #include "wtf/Vector.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 class Attribute;
-class DocumentType;
 class Element;
 class Node;
 
 class MarkupAccumulator {
   WTF_MAKE_NONCOPYABLE(MarkupAccumulator);
   STACK_ALLOCATED();
 
  public:
   MarkupAccumulator(EAbsoluteURLs,
                     SerializationType = SerializationType::AsOwnerDocument);
@@ skipping 32 matching lines @@
 template <typename Strategy>
 String serializeNodes(MarkupAccumulator&, Node&, EChildrenOnly);
 
 extern template String serializeNodes<EditingStrategy>(MarkupAccumulator&,
                                                        Node&,
                                                        EChildrenOnly);
 
 }  // namespace blink
 
 #endif