chrome: Cleanup class/struct forward declarations

chrome/browser/chromeos/policy/configuration_policy_handler_chromeos.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 CHROME_BROWSER_CHROMEOS_POLICY_CONFIGURATION_POLICY_HANDLER_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_CONFIGURATION_POLICY_HANDLER_CHROMEOS_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "chrome/browser/extensions/policy_handlers.h"
 #include "chromeos/network/network_ui_data.h"
 #include "components/onc/onc_constants.h"
 #include "components/policy/core/browser/configuration_policy_handler.h"
 
 namespace base {
-class DictionaryValue;
 class Value;
 }
 
 namespace policy {
 
 class Schema;
 
 // ConfigurationPolicyHandler for policies referencing external data.
 class ExternalDataPolicyHandler : public TypeCheckingPolicyHandler {
  public:
@@ skipping 135 matching lines @@
   void ApplyPolicySettings(const PolicyMap& policies,
                            PrefValueMap* prefs) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ScreenLockDelayPolicyHandler);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_CONFIGURATION_POLICY_HANDLER_CHROMEOS_H_