Standardize usage of virtual/override/final in chrome/

chrome/common/extensions/api/commands/commands_handler.h

 // Copyright (c) 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_API_COMMANDS_COMMANDS_HANDLER_H_
 #define CHROME_COMMON_EXTENSIONS_API_COMMANDS_COMMANDS_HANDLER_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/common/extensions/command.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/manifest.h"
 #include "extensions/common/manifest_handler.h"
 
 namespace extensions {
 
 struct CommandsInfo : public Extension::ManifestData {
   CommandsInfo();
-  virtual ~CommandsInfo();
+  ~CommandsInfo() override;
 
   // Optional list of commands (keyboard shortcuts).
   // These commands are the commands which the extension wants to use, which are
   // not necessarily the ones it can use, as it might be inactive (see also
   // Get*Command[s] in CommandService).
   scoped_ptr<Command> browser_action_command;
   scoped_ptr<Command> page_action_command;
   CommandMap named_commands;
 
   static const Command* GetBrowserActionCommand(const Extension* extension);
   static const Command* GetPageActionCommand(const Extension* extension);
   static const CommandMap* GetNamedCommands(const Extension* extension);
 };
 
 // Parses the "commands" manifest key.
 class CommandsHandler : public ManifestHandler {
  public:
   CommandsHandler();
-  virtual ~CommandsHandler();
+  ~CommandsHandler() override;
 
-  virtual bool Parse(Extension* extension, base::string16* error) override;
-  virtual bool AlwaysParseForType(Manifest::Type type) const override;
+  bool Parse(Extension* extension, base::string16* error) override;
+  bool AlwaysParseForType(Manifest::Type type) const override;
 
  private:
   // If the extension defines a browser action, but no command for it, then
   // we synthesize a generic one, so the user can configure a shortcut for it.
   // No keyboard shortcut will be assigned to it, until the user selects one.
   void MaybeSetBrowserActionDefault(const Extension* extension,
                                     CommandsInfo* info);
 
-  virtual const std::vector<std::string> Keys() const override;
+  const std::vector<std::string> Keys() const override;
 
   DISALLOW_COPY_AND_ASSIGN(CommandsHandler);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_API_COMMANDS_COMMANDS_HANDLER_H_