Clean up forward declarations in Source/core/frame

Source/core/frame/csp/ContentSecurityPolicy.h

 /*
  * Copyright (C) 2011 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:
  * 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 33 matching lines @@
 namespace WTF {
 class OrdinalNumber;
 }
 
 namespace blink {
 
 class ContentSecurityPolicyResponseHeaders;
 class ConsoleMessage;
 class CSPDirectiveList;
 class CSPSource;
-class DOMStringList;
 class Document;
-class JSONObject;
 class KURL;
 class SecurityOrigin;
 
 typedef int SandboxFlags;
 typedef Vector<OwnPtr<CSPDirectiveList> > CSPDirectiveListVector;
 typedef WillBePersistentHeapVector<RefPtrWillBeMember<ConsoleMessage> > ConsoleMessageVector;
 
 class ContentSecurityPolicy : public RefCounted<ContentSecurityPolicy> {
     WTF_MAKE_FAST_ALLOCATED;
 public:
@@ skipping 157 matching lines @@
     SandboxFlags m_sandboxMask;
     ReferrerPolicy m_referrerPolicy;
     String m_disableEvalErrorMessage;
 
     OwnPtr<CSPSource> m_selfSource;
 };
 
 }
 
 #endif