blink: Cleanup class/struct forward declarations

third_party/WebKit/public/web/WebDocument.h

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 22 matching lines @@
 
 #include "WebDraggableRegion.h"
 #include "WebExceptionCode.h"
 #include "WebFrame.h"
 #include "WebNode.h"
 #include "public/platform/WebColor.h"
 #include "public/platform/WebReferrerPolicy.h"
 #include "public/platform/WebSecurityOrigin.h"
 #include "public/platform/WebVector.h"
 
-#if BLINK_IMPLEMENTATION
-namespace WTF {
-template <typename T>
-class PassRefPtr;
-}
-#endif
-
 namespace v8 {
 class Value;
 template <class T>
 class Local;
 }
 
 namespace blink {
 
 class Document;
-class DocumentType;
 class WebAXObject;
 class WebElement;
 class WebFormElement;
 class WebElementCollection;
 class WebString;
 class WebURL;
 struct WebDistillabilityFeatures;
 
 // Provides readonly access to some properties of a DOM document.
 class WebDocument : public WebNode {
@@ skipping 88 matching lines @@
   BLINK_EXPORT WebDocument& operator=(Document*);
   BLINK_EXPORT operator Document*() const;
 #endif
 };
 
 DECLARE_WEB_NODE_TYPE_CASTS(WebDocument);
 
 }  // namespace blink
 
 #endif