Clean up forward declarations in Source/core/loader

Source/core/loader/FrameLoadRequest.h

 /*
  * Copyright (C) 2003, 2006, 2010 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 17 matching lines @@
 
 #include "core/dom/Document.h"
 #include "core/events/Event.h"
 #include "core/fetch/ResourceLoaderOptions.h"
 #include "core/html/HTMLFormElement.h"
 #include "core/loader/FrameLoaderTypes.h"
 #include "core/loader/SubstituteData.h"
 #include "platform/network/ResourceRequest.h"
 
 namespace blink {
-class LocalFrame;
 
 struct FrameLoadRequest {
     STACK_ALLOCATED();
 public:
     explicit FrameLoadRequest(Document* originDocument)
         : m_originDocument(originDocument)
         , m_lockBackForwardList(false)
         , m_clientRedirect(NotClientRedirect)
         , m_shouldSendReferrer(MaybeSendReferrer)
         , m_shouldCheckMainWorldContentSecurityPolicy(CheckContentSecurityPolicy)
@@ skipping 79 matching lines @@
     ClientRedirectPolicy m_clientRedirect;
     RefPtrWillBeMember<Event> m_triggeringEvent;
     RefPtrWillBeMember<FormState> m_formState;
     ShouldSendReferrer m_shouldSendReferrer;
     ContentSecurityPolicyCheck m_shouldCheckMainWorldContentSecurityPolicy;
 };
 
 }
 
 #endif // FrameLoadRequest_h