content: Cleanup class/struct forward declarations

content/public/browser/resource_dispatcher_host.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_RESOURCE_DISPATCHER_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RESOURCE_DISPATCHER_HOST_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "content/common/content_export.h"
 
 namespace net {
 class URLRequest;
 }
 
 namespace content {
 
-class DownloadItem;
 class ResourceContext;
 class ResourceDispatcherHostDelegate;
-struct DownloadSaveInfo;
-struct Referrer;
 class RenderFrameHost;
 
 // This callback is invoked when the interceptor finishes processing the
 // header.
 // Parameter 1 is a bool indicating success or failure.
 // Parameter 2 contains the error code in case of failure, else 0.
 typedef base::Callback<void(bool, int)> OnHeaderProcessedCallback;
 
 // This callback is registered by interceptors who are interested in being
 // notified of certain HTTP headers in outgoing requests. For e.g. Origin.
@@ skipping 47 matching lines @@
                                    const std::string& starts_with,
                                    const InterceptorCallback& interceptor) = 0;
 
  protected:
   virtual ~ResourceDispatcherHost() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RESOURCE_DISPATCHER_HOST_H_