Clean up forward declarations in Source/core/fetch and /loader

Source/core/fetch/CrossOriginAccessControl.h

 /*
  * Copyright (C) 2008 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 18 matching lines @@
 
 #include "core/fetch/ResourceLoaderOptions.h"
 #include "platform/network/ResourceRequest.h"
 #include "wtf/Forward.h"
 #include "wtf/HashSet.h"
 
 namespace blink {
 
 typedef HashSet<String, CaseFoldingHash> HTTPHeaderSet;
 
-class HTTPHeaderMap;
 class Resource;
 struct ResourceLoaderOptions;
 class ResourceRequest;
 class ResourceResponse;
 class SecurityOrigin;
 
 enum AccessControlStatus {
     NotSharableCrossOrigin,
     SharableCrossOrigin
 };
 
 class CrossOriginAccessControl {
 public:
     static bool isLegalRedirectLocation(const KURL&, String& errorDescription);
     static bool handleRedirect(Resource*, SecurityOrigin*, ResourceRequest&, const ResourceResponse&, ResourceLoaderOptions&, String&);
 };
 
 bool isOnAccessControlResponseHeaderWhitelist(const String&);
 
 void updateRequestForAccessControl(ResourceRequest&, SecurityOrigin*, StoredCredentials);
 ResourceRequest createAccessControlPreflightRequest(const ResourceRequest&, SecurityOrigin*);
 
 bool passesAccessControlCheck(const ResourceResponse&, StoredCredentials, SecurityOrigin*, String& errorDescription);
 bool passesPreflightStatusCheck(const ResourceResponse&, String& errorDescription);
 void parseAccessControlExposeHeadersAllowList(const String& headerValue, HTTPHeaderSet&);
 
 } // namespace blink
 
 #endif // CrossOriginAccessControl_h