C++11 override style change for athena

athena/test/chrome/athena_browsertest.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 ATHENA_TEST_CHROME_ATHENA_BROWSERTEST_H_
 #define ATHENA_TEST_CHROME_ATHENA_BROWSERTEST_H_
 
 #include "chrome/test/base/in_process_browser_test.h"
 
 namespace athena {
 
 // Base class for athena tests which allows to use WebActivities.
 //
 // Note: To avoid asynchronous resource manager events, the memory pressure
 // callback gets turned off at the beginning to a low memory pressure.
 class AthenaBrowserTest : public InProcessBrowserTest {
  public:
   AthenaBrowserTest();
-  virtual ~AthenaBrowserTest();
+  ~AthenaBrowserTest() override;
 
  protected:
   // BrowserTestBase:
-  virtual void SetUpOnMainThread() override;
+  void SetUpOnMainThread() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AthenaBrowserTest);
 };
 
 }  // namespace athena
 
 #endif //  ATHENA_TEST_CHROME_ATHENA_BROWSERTEST_H_