C++11 override style change for athena

athena/extensions/shell/athena_shell_scheme_classifier.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_EXTENSIONS_SHELL_ATHENA_SHELL_SCHEME_CLASSIFIER_H_
 #define ATHENA_EXTENSIONS_SHELL_ATHENA_SHELL_SCHEME_CLASSIFIER_H_
 
 #include "base/macros.h"
 #include "components/omnibox/autocomplete_scheme_classifier.h"
 
 namespace athena {
 
 // The AutocompleteSchemeClassifier implementation for athena_main.
 class AthenaShellSchemeClassifier : public AutocompleteSchemeClassifier {
  public:
   AthenaShellSchemeClassifier();
-  virtual ~AthenaShellSchemeClassifier();
+  ~AthenaShellSchemeClassifier() override;
 
   // AutocompleteSchemeClassifier:
-  virtual metrics::OmniboxInputType::Type GetInputTypeForScheme(
+  metrics::OmniboxInputType::Type GetInputTypeForScheme(
       const std::string& scheme) const override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AthenaShellSchemeClassifier);
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_EXTENSIONS_SHELL_ATHENA_SHELL_SCHEME_CLASSIFIER_H_