Standardize usage of virtual/override/final specifiers.

components/user_manager/empty_user_info.h

 // Copyright 2014 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_USER_MANAGER_EMPTY_USER_INFO_H_
 #define COMPONENTS_USER_MANAGER_EMPTY_USER_INFO_H_
 
 #include <string>
 
 #include "base/strings/string16.h"
 #include "components/user_manager/user_info.h"
 #include "components/user_manager/user_manager_export.h"
 #include "ui/gfx/image/image_skia.h"
 
 namespace user_manager {
 
 // Trivial implementation of UserInfo interface which triggers
 // NOTIMPLEMENTED() for each method.
 class USER_MANAGER_EXPORT EmptyUserInfo : public UserInfo {
  public:
   EmptyUserInfo();
-  virtual ~EmptyUserInfo();
+  ~EmptyUserInfo() override;
 
   // UserInfo:
-  virtual base::string16 GetDisplayName() const override;
-  virtual base::string16 GetGivenName() const override;
-  virtual std::string GetEmail() const override;
-  virtual std::string GetUserID() const override;
-  virtual const gfx::ImageSkia& GetImage() const override;
+  base::string16 GetDisplayName() const override;
+  base::string16 GetGivenName() const override;
+  std::string GetEmail() const override;
+  std::string GetUserID() const override;
+  const gfx::ImageSkia& GetImage() const override;
 
  private:
   const gfx::ImageSkia null_image_;
 
   DISALLOW_COPY_AND_ASSIGN(EmptyUserInfo);
 };
 
 }  // namespace user_manager
 
 #endif  // COMPONENTS_USER_MANAGER_EMPTY_USER_INFO_H_