Update {virtual,override} to follow C++11 style in chrome.

chrome/browser/ui/webui/options/preferences_browsertest.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_UI_WEBUI_OPTIONS_PREFERENCES_BROWSERTEST_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_PREFERENCES_BROWSERTEST_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 18 matching lines @@
 class NotificationSource;
 class RenderViewHost;
 }
 
 // Tests verifying that the JavaScript Preferences class, the underlying C++
 // CoreOptionsHandler and the specialized classes handling Chrome OS device and
 // proxy prefs behave correctly.
 class PreferencesBrowserTest : public InProcessBrowserTest {
  public:
   PreferencesBrowserTest();
-  ~PreferencesBrowserTest();
+  ~PreferencesBrowserTest() override;
 
   // InProcessBrowserTest implementation:
-  virtual void SetUpOnMainThread() override;
+  void SetUpOnMainThread() override;
 
   void OnPreferenceChanged(const std::string& pref_name);
 
  protected:
   MOCK_METHOD1(OnCommit, void(const PrefService::Preference*));
 
   void SetUpPrefs();
 
   // InProcessBrowserTest implementation:
-  virtual void SetUpInProcessBrowserTestFixture() override;
+  void SetUpInProcessBrowserTestFixture() override;
 
   // Sets user policies through the mock policy provider.
   void SetUserPolicies(const std::vector<std::string>& names,
                        const std::vector<base::Value*>& values,
                        policy::PolicyLevel level);
   // Clears user policies.
   void ClearUserPolicies();
   // Set user-modified pref values directly in the C++ backend.
   void SetUserValues(const std::vector<std::string>& names,
                      const std::vector<base::Value*>& values);
@@ skipping 124 matching lines @@
   std::vector<std::string> pref_names_;
   std::vector<std::string> policy_names_;
   ScopedVector<base::Value> default_values_;
   ScopedVector<base::Value> non_default_values_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PreferencesBrowserTest);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_PREFERENCES_BROWSERTEST_H_