components: Cleanup class/struct fwd declarations

components/policy/core/browser/configuration_policy_handler_list.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_BROWSER_CONFIGURATION_POLICY_HANDLER_LIST_H_
 #define COMPONENTS_POLICY_CORE_BROWSER_CONFIGURATION_POLICY_HANDLER_LIST_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "components/policy/core/common/policy_details.h"
 #include "components/policy/core/common/policy_map.h"
 #include "components/policy/policy_export.h"
 
 class PrefValueMap;
 
 namespace policy {
 
 class ConfigurationPolicyHandler;
 class PolicyErrorMap;
 struct PolicyHandlerParameters;
-struct PolicyToPreferenceMapEntry;
 class Schema;
 
 // Converts policies to their corresponding preferences by applying a list of
 // ConfigurationPolicyHandler objects. This includes error checking and cleaning
 // up policy values for display.
 class POLICY_EXPORT ConfigurationPolicyHandlerList {
  public:
   typedef base::Callback<void(PolicyHandlerParameters*)>
       PopulatePolicyHandlerParametersCallback;
 
@@ skipping 27 matching lines @@
 
 // Callback with signature of BuildHandlerList(), to be used in constructor of
 // BrowserPolicyConnector.
 typedef base::Callback<std::unique_ptr<ConfigurationPolicyHandlerList>(
     const Schema&)>
     HandlerListFactory;
 
 }  // namespace policy
 
 #endif  // COMPONENTS_POLICY_CORE_BROWSER_CONFIGURATION_POLICY_HANDLER_LIST_H_