blink: Cleanup class/struct forward declarations

third_party/WebKit/Source/core/dom/ProcessingInstruction.h

 /*
  * Copyright (C) 2000 Peter Kelly (pmk@post.com)
  * Copyright (C) 2006 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 13 matching lines @@
 
 #include "core/dom/CharacterData.h"
 #include "core/dom/StyleEngineContext.h"
 #include "core/fetch/ResourceOwner.h"
 #include "core/loader/resource/StyleSheetResource.h"
 #include "core/loader/resource/StyleSheetResourceClient.h"
 
 namespace blink {
 
 class StyleSheet;
-class CSSStyleSheet;
 class EventListener;
 
 class ProcessingInstruction final : public CharacterData,
                                     private ResourceOwner<StyleSheetResource> {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(ProcessingInstruction);
 
  public:
   static ProcessingInstruction* create(Document&,
                                        const String& target,
@@ skipping 74 matching lines @@
                        getNodeType() == Node::kProcessingInstructionNode);
 
 inline bool isXSLStyleSheet(const Node& node) {
   return node.getNodeType() == Node::kProcessingInstructionNode &&
          toProcessingInstruction(node).isXSL();
 }
 
 }  // namespace blink
 
 #endif  // ProcessingInstruction_h