content: Cleanup class/struct forward declarations

content/public/child/request_peer.h

 // Copyright 2014 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_CHILD_REQUEST_PEER_H_
 #define CONTENT_PUBLIC_CHILD_REQUEST_PEER_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "content/common/content_export.h"
 
-class GURL;
-
 namespace base {
 class TimeTicks;
 }
 
 namespace net {
 struct RedirectInfo;
 }
 
 namespace content {
 
@@ skipping 76 matching lines @@
                                   bool stale_copy_in_cache,
                                   const base::TimeTicks& completion_time,
                                   int64_t total_transfer_size) = 0;
 
   virtual ~RequestPeer() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_CHILD_REQUEST_PEER_H_