Standardize usage of virtual/override/final in extensions/

extensions/common/manifest_url_handlers.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 EXTENSIONS_COMMON_MANIFEST_URL_HANDLERS_H_
 #define EXTENSIONS_COMMON_MANIFEST_URL_HANDLERS_H_
 
 #include <string>
 
 #include "extensions/common/extension.h"
@@ skipping 34 matching lines @@
   static const GURL& GetAboutPage(const Extension* extension);
 
   // Returns the webstore page URL for this extension.
   static const GURL GetDetailsURL(const Extension* extension);
 };
 
 // Parses the "homepage_url" manifest key.
 class HomepageURLHandler : public ManifestHandler {
  public:
   HomepageURLHandler();
-  virtual ~HomepageURLHandler();
+  ~HomepageURLHandler() override;
 
-  virtual bool Parse(Extension* extension, base::string16* error) override;
+  bool Parse(Extension* extension, base::string16* error) override;
 
  private:
-  virtual const std::vector<std::string> Keys() const override;
+  const std::vector<std::string> Keys() const override;
 
   DISALLOW_COPY_AND_ASSIGN(HomepageURLHandler);
 };
 
 // Parses the "update_url" manifest key.
 class UpdateURLHandler : public ManifestHandler {
  public:
   UpdateURLHandler();
-  virtual ~UpdateURLHandler();
+  ~UpdateURLHandler() override;
 
-  virtual bool Parse(Extension* extension, base::string16* error) override;
+  bool Parse(Extension* extension, base::string16* error) override;
 
  private:
-  virtual const std::vector<std::string> Keys() const override;
+  const std::vector<std::string> Keys() const override;
 
   DISALLOW_COPY_AND_ASSIGN(UpdateURLHandler);
 };
 
 // Parses the "about_page" manifest key.
 // TODO(sashab): Make this and any other similar handlers extend from the same
 // abstract class, URLManifestHandler, which has pure virtual methods for
 // detecting the required URL type (relative or absolute) and abstracts the
 // URL parsing logic away.
 class AboutPageHandler : public ManifestHandler {
  public:
   AboutPageHandler();
-  virtual ~AboutPageHandler();
+  ~AboutPageHandler() 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;
 
  private:
-  virtual const std::vector<std::string> Keys() const override;
+  const std::vector<std::string> Keys() const override;
 
   DISALLOW_COPY_AND_ASSIGN(AboutPageHandler);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_MANIFEST_URL_HANDLERS_H_