Reduce header dependencies in net/

net/base/dns_resolution_observer.h

 // Copyright (c) 2006-2008 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.
 
 // This file supports network stack independent notification of progress
 // towards resolving a hostname.
 
 // The observer class supports exactly one active (Add'ed) instance, and in
 // typical usage, that observer will be Add'ed during process startup, and
 // Remove'd during process termination.
 
 
 #ifndef NET_BASE_DNS_RESOLUTION_OBSERVER_H_
 #define NET_BASE_DNS_RESOLUTION_OBSERVER_H_
 
 #include <string>
 
-#include "googleurl/src/gurl.h"
+class GURL;
 
 namespace net {
 
 class DnsResolutionObserver {
  public:
   virtual ~DnsResolutionObserver() {}
 
   // For each OnStartResolution() notification, there should be a later
   // OnFinishResolutionWithStatus() indicating completion of the resolution
   // activity.
@@ skipping 27 matching lines @@
 // implementations.  This above observer class will relay the notifications
 // to any registered observer.
 void DidStartDnsResolution(const std::string& name,
                            void* context);
 void DidFinishDnsResolutionWithStatus(bool was_resolved,
                                       const GURL& url,
                                       void* context);
 }  // namspace net
 
 #endif  // NET_BASE_DNS_RESOLUTION_OBSERVER_H_