components: Cleanup class/struct fwd declarations

components/policy/core/common/cloud/cloud_policy_constants.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 COMPONENTS_POLICY_CORE_COMMON_CLOUD_CLOUD_POLICY_CONSTANTS_H_
 #define COMPONENTS_POLICY_CORE_COMMON_CLOUD_CLOUD_POLICY_CONSTANTS_H_
 
 #include <string>
 
 #include "components/policy/policy_export.h"
 
-namespace enterprise_management {
-class PolicyData;
-}
-
 namespace policy {
 
 // Constants related to the device management protocol.
 namespace dm_protocol {
 
 // Name extern constants for URL query parameters.
 POLICY_EXPORT extern const char kParamAgent[];
 POLICY_EXPORT extern const char kParamAppType[];
 POLICY_EXPORT extern const char kParamCritical[];
 POLICY_EXPORT extern const char kParamDeviceID[];
@@ skipping 104 matching lines @@
                                    // appropriate action (currently, launching
                                    // offline demo mode).
   DEVICE_MODE_CONSUMER_KIOSK_AUTOLAUNCH,  // The device is locally owned as
                                           // consumer kiosk with ability to auto
                                           // launch a kiosk webapp.
 };
 
 }  // namespace policy
 
 #endif  // COMPONENTS_POLICY_CORE_COMMON_CLOUD_CLOUD_POLICY_CONSTANTS_H_