Standardize usage of virtual/override/final in chrome/

chrome/common/extensions/manifest_handlers/ui_overrides_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_COMMON_EXTENSIONS_MANIFEST_HANDLERS_UI_OVERRIDES_HANDLER_H_
 #define CHROME_COMMON_EXTENSIONS_MANIFEST_HANDLERS_UI_OVERRIDES_HANDLER_H_
 
 #include "chrome/common/extensions/api/manifest_types.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/manifest_handler.h"
 
 namespace extensions {
 
 class ManifestPermission;
 
 // UIOverrides is associated with "chrome_ui_overrides" manifest key, and
 // represents manifest settings to override aspects of the Chrome user
 // interface.
 struct UIOverrides : public Extension::ManifestData {
   UIOverrides();
-  virtual ~UIOverrides();
+  ~UIOverrides() override;
 
   static const UIOverrides* Get(const Extension* extension);
 
   static bool RemovesBookmarkButton(const Extension* extension);
   static bool RemovesBookmarkShortcut(const Extension* extension);
   static bool RemovesBookmarkOpenPagesShortcut(const Extension* extension);
 
   scoped_ptr<api::manifest_types::ChromeUIOverrides::Bookmarks_ui> bookmarks_ui;
 
   scoped_ptr<ManifestPermission> manifest_permission;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(UIOverrides);
 };
 
 class UIOverridesHandler : public ManifestHandler {
  public:
   UIOverridesHandler();
-  virtual ~UIOverridesHandler();
+  ~UIOverridesHandler() override;
 
-  virtual bool Parse(Extension* extension, base::string16* error) override;
-  virtual bool Validate(const Extension* extension,
-                        std::string* error,
-                        std::vector<InstallWarning>* warnings) const override;
+  bool Parse(Extension* extension, base::string16* error) override;
+  bool Validate(const Extension* extension,
+                std::string* error,
+                std::vector<InstallWarning>* warnings) const override;
 
-  virtual ManifestPermission* CreatePermission() override;
-  virtual ManifestPermission* CreateInitialRequiredPermission(
+  ManifestPermission* CreatePermission() override;
+  ManifestPermission* CreateInitialRequiredPermission(
       const Extension* extension) override;
 
  private:
   class ManifestPermissionImpl;
 
-  virtual const std::vector<std::string> Keys() const override;
+  const std::vector<std::string> Keys() const override;
 
   DISALLOW_COPY_AND_ASSIGN(UIOverridesHandler);
 };
 
 }  // namespace extensions
 #endif  // CHROME_COMMON_EXTENSIONS_MANIFEST_HANDLERS_UI_OVERRIDES_HANDLER_H_