Standardize usage of virtual/override/final in chrome/browser/download/

chrome/browser/download/download_dir_policy_handler.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_DOWNLOAD_DOWNLOAD_DIR_POLICY_HANDLER_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_DIR_POLICY_HANDLER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "components/policy/core/browser/configuration_policy_handler.h"
 
 class PrefValueMap;
 
 namespace policy {
 class PolicyMap;
 }  // namespace policy
 
 // ConfigurationPolicyHandler for the DownloadDirectory policy.
 class DownloadDirPolicyHandler : public policy::TypeCheckingPolicyHandler {
  public:
   DownloadDirPolicyHandler();
-  virtual ~DownloadDirPolicyHandler();
+  ~DownloadDirPolicyHandler() override;
 
   // ConfigurationPolicyHandler methods:
-  virtual bool CheckPolicySettings(const policy::PolicyMap& policies,
-                                   policy::PolicyErrorMap* errors) override;
+  bool CheckPolicySettings(const policy::PolicyMap& policies,
+                           policy::PolicyErrorMap* errors) override;
 
-  virtual void ApplyPolicySettingsWithParameters(
+  void ApplyPolicySettingsWithParameters(
       const policy::PolicyMap& policies,
       const policy::PolicyHandlerParameters& parameters,
       PrefValueMap* prefs) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DownloadDirPolicyHandler);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_DIR_POLICY_HANDLER_H_