chromeos: Cleanup class/struct fwd declarations

chromeos/network/network_configuration_observer.h

 // Copyright (c) 2013 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 CHROMEOS_NETWORK_NETWORK_CONFIGURATION_OBSERVER_H_
 #define CHROMEOS_NETWORK_NETWORK_CONFIGURATION_OBSERVER_H_
 
 #include <string>
 
 #include "base/macros.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace chromeos {
 
-struct NetworkConfiguration;
-
 // Observer class for network configuration events.
 class NetworkConfigurationObserver {
  public:
   // Indicates whether a configuration change is triggered by a user action,
   // by an extension or by policy.
   enum Source {
     // Triggered by a user action.
     SOURCE_USER_ACTION,
     // Triggered by an extension to install a configuration.
     SOURCE_EXTENSION_INSTALL,
@@ skipping 41 matching lines @@
  protected:
   virtual ~NetworkConfigurationObserver() {}
 
  private:
   DISALLOW_ASSIGN(NetworkConfigurationObserver);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_NETWORK_NETWORK_CONFIGURATION_OBSERVER_H_