net: Cleanup class/struct forward declarations

net/base/network_change_notifier.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 NET_BASE_NETWORK_CHANGE_NOTIFIER_H_
 #define NET_BASE_NETWORK_CHANGE_NOTIFIER_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/observer_list_threadsafe.h"
 #include "base/time/time.h"
 #include "net/base/net_export.h"
 
-class GURL;
-
 namespace net {
 
 struct DnsConfig;
 class HistogramWatcher;
 class NetworkChangeNotifierFactory;
 struct NetworkInterface;
 typedef std::vector<NetworkInterface> NetworkInterfaceList;
 class URLRequest;
 
 #if defined(OS_LINUX)
@@ skipping 545 matching lines @@
 
   // Set true to disable non-test notifications (to prevent flakes in tests).
   static bool test_notifications_only_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifier);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_NETWORK_CHANGE_NOTIFIER_H_