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

chrome/browser/extensions/startup_helper.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 CHROME_BROWSER_EXTENSIONS_STARTUP_HELPER_H_
 #define CHROME_BROWSER_EXTENSIONS_STARTUP_HELPER_H_
 
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/extensions/pack_extension_job.h"
 
 class Profile;
 
 namespace base {
 class CommandLine;
 }
 
 namespace extensions {
 
 // Initialization helpers for various Extension startup actions.
 class StartupHelper : public PackExtensionJob::Client {
  public:
   StartupHelper();
-  virtual ~StartupHelper();
+  ~StartupHelper() override;
 
-  virtual void OnPackSuccess(
-      const base::FilePath& crx_path,
-      const base::FilePath& output_private_key_path) override;
-  virtual void OnPackFailure(const std::string& error_message,
-                             ExtensionCreator::ErrorType type) override;
+  void OnPackSuccess(const base::FilePath& crx_path,
+                     const base::FilePath& output_private_key_path) override;
+  void OnPackFailure(const std::string& error_message,
+                     ExtensionCreator::ErrorType type) override;
 
   // Handle --pack-extension flag from the |cmd_line| by packing the specified
   // extension. Returns false if the pack job failed.
   bool PackExtension(const base::CommandLine& cmd_line);
 
   // Validates a crx at the path given by the --validate-extension flag - can
   // it be installed? Returns true if the crx is valid, or false otherwise.
   // If the return value is false, a description of the problem may be written
   // into |error|.
   bool ValidateCrx(const base::CommandLine& cmd_line, std::string* error);
 
   // Handle --install-ephemeral-app-from-webstore flag from |cmd_line| by
   // downloading metadata from the webstore for the given id, prompting the
   // user to confirm, and then downloading the crx and installing it.
   bool InstallEphemeralApp(const base::CommandLine& cmd_line, Profile* profile);
 
  private:
   scoped_refptr<PackExtensionJob> pack_job_;
   bool pack_job_succeeded_;
 
   DISALLOW_COPY_AND_ASSIGN(StartupHelper);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_STARTUP_HELPER_H_