Remove unused includes from core/{editing,fileapi,history,html}

Source/core/html/LinkResource.h

 /*
  * Copyright (C) 2013 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 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef LinkResource_h
 #define LinkResource_h
 
 #include "core/loader/cache/CachedResourceRequest.h"
 #include "weborigin/KURL.h"
-#include "wtf/Forward.h"
 #include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class HTMLLinkElement;
 
 class LinkResource : public RefCounted<LinkResource> {
 public:
     enum Type {
@@ skipping 23 matching lines @@
 
 private:
     HTMLLinkElement* m_owner;
     KURL m_url;
     String m_charset;
 };
 
 } // namespace WebCore
 
 #endif // LinkResource_h