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

chrome/browser/extensions/startup_helper.h

Index: chrome/browser/extensions/startup_helper.h
diff --git a/chrome/browser/extensions/startup_helper.h b/chrome/browser/extensions/startup_helper.h
index d6d36b47bb620b0aabfcdb62cb95a05b55120175..c291e381d50809a9d04c8baf11b9baac182efd3a 100644
--- a/chrome/browser/extensions/startup_helper.h
+++ b/chrome/browser/extensions/startup_helper.h
@@ -20,13 +20,12 @@ namespace extensions {
 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.