chrome: Cleanup class/struct forward declarations

chrome/browser/chromeos/policy/device_network_configuration_updater.h

 // Copyright 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 CHROME_BROWSER_CHROMEOS_POLICY_DEVICE_NETWORK_CONFIGURATION_UPDATER_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_DEVICE_NETWORK_CONFIGURATION_UPDATER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/callback_list.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/chromeos/policy/network_configuration_updater.h"
 #include "components/onc/onc_constants.h"
 
 namespace base {
 class DictionaryValue;
 class ListValue;
-class Value;
 }
 
 namespace chromeos {
 class CrosSettings;
 class ManagedNetworkConfigurationHandler;
 class NetworkDeviceHandler;
-
-namespace onc {
-class CertificateImporter;
-}
 }
 
 namespace policy {
 
 class PolicyService;
 
 // Implements addtional special handling of ONC device policies, which requires
 // listening for notifications from CrosSettings.
 class DeviceNetworkConfigurationUpdater : public NetworkConfigurationUpdater {
  public:
@@ skipping 30 matching lines @@
 
   base::WeakPtrFactory<DeviceNetworkConfigurationUpdater> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceNetworkConfigurationUpdater);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_DEVICE_NETWORK_CONFIGURATION_UPDATER_H_