Clean up forward declarations in Source/core/loader

Source/core/loader/ThreadableLoader.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 "core/fetch/ResourceLoaderOptions.h"
 #include "platform/CrossThreadCopier.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
-    class ResourceError;
     class ResourceRequest;
-    class ResourceResponse;
     class ExecutionContext;
     class ThreadableLoaderClient;
 
     enum CrossOriginRequestPolicy {
         DenyCrossOriginRequests,
         UseAccessControl,
         AllowCrossOriginRequests
     };
 
     enum PreflightPolicy {
@@ skipping 83 matching lines @@
 
         virtual ~ThreadableLoader() { }
 
     protected:
         ThreadableLoader() { }
     };
 
 } // namespace blink
 
 #endif // ThreadableLoader_h