chrome: Cleanup class/struct forward declarations

chrome/browser/chromeos/settings/device_settings_service.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_SETTINGS_DEVICE_SETTINGS_SERVICE_H_
 #define CHROME_BROWSER_CHROMEOS_SETTINGS_DEVICE_SETTINGS_SERVICE_H_
 
 #include <deque>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 #include "chrome/browser/chromeos/policy/proto/chrome_device_policy.pb.h"
 #include "chromeos/dbus/session_manager_client.h"
 #include "components/ownership/owner_settings_service.h"
 #include "components/policy/core/common/cloud/cloud_policy_constants.h"
 #include "components/policy/core/common/cloud/cloud_policy_validator.h"
 #include "components/policy/proto/device_management_backend.pb.h"
 #include "crypto/scoped_nss_types.h"
 
-namespace crypto {
-class RSAPrivateKey;
-}
-
 namespace ownership {
 class OwnerKeyUtil;
 class PublicKey;
 }
 
 namespace chromeos {
 
 class SessionManagerOperation;
 
 // Deals with the low-level interface to Chrome OS device settings. Device
@@ skipping 217 matching lines @@
   ScopedTestDeviceSettingsService();
   ~ScopedTestDeviceSettingsService();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ScopedTestDeviceSettingsService);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_SETTINGS_DEVICE_SETTINGS_SERVICE_H_