Standardize usage of virtual/override/final in extensions/

extensions/test/result_catcher.h

 // Copyright 2014 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_TEST_RESULT_CATCHER_H_
 #define EXTENSIONS_TEST_RESULT_CATCHER_H_
 
 #include <deque>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 namespace content {
 class BrowserContext;
 }  // namespace content
 
 namespace extensions {
 
 // Helper class that observes tests failing or passing. Observation starts
 // when the class is constructed. Get the next result by calling
 // GetNextResult() and message() if GetNextResult() return false. If there
 // are no results, this method will pump the UI message loop until one is
 // received.
 class ResultCatcher : public content::NotificationObserver {
  public:
   ResultCatcher();
-  virtual ~ResultCatcher();
+  ~ResultCatcher() override;
 
   // Pumps the UI loop until a notification is received that an API test
   // succeeded or failed. Returns true if the test succeeded, false otherwise.
   bool GetNextResult();
 
   void RestrictToBrowserContext(content::BrowserContext* context) {
     browser_context_restriction_ = context;
   }
 
   const std::string& message() { return message_; }
 
  private:
   // content::NotificationObserver:
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) override;
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
 
   content::NotificationRegistrar registrar_;
 
   // A sequential list of pass/fail notifications from the test extension(s).
   std::deque<bool> results_;
 
   // If it failed, what was the error message?
   std::deque<std::string> messages_;
   std::string message_;
 
   // If non-NULL, we will listen to events from this BrowserContext only.
   content::BrowserContext* browser_context_restriction_;
 
   // True if we're in a nested message loop waiting for results from
   // the extension.
   bool waiting_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_TEST_RESULT_CATCHER_H_