net: Cleanup class/struct forward declarations

net/base/proxy_delegate.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 NET_BASE_PROXY_DELEGATE_H_
 #define NET_BASE_PROXY_DELEGATE_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "net/base/net_export.h"
 
 class GURL;
 
 namespace net {
 
 class HttpRequestHeaders;
 class HttpResponseHeaders;
 class HostPortPair;
 class ProxyInfo;
 class ProxyServer;
 class ProxyService;
-class URLRequest;
 
 // Delegate for setting up a connection.
 class NET_EXPORT ProxyDelegate {
  public:
   ProxyDelegate() {
   }
 
   virtual ~ProxyDelegate() {
   }
 
@@ skipping 53 matching lines @@
   // server if no valid proxy server is available.
   virtual ProxyServer GetDefaultAlternativeProxy() const = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ProxyDelegate);
 };
 
 }
 
 #endif  // NET_BASE_PROXY_DELEGATE_H_