Update {virtual,override,final} to follow C++11 style in chrome/browser/chromeos/settings.

chrome/browser/chromeos/settings/system_settings_provider.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_CHROMEOS_SETTINGS_SYSTEM_SETTINGS_PROVIDER_H_
 #define CHROME_BROWSER_CHROMEOS_SETTINGS_SYSTEM_SETTINGS_PROVIDER_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "chromeos/settings/cros_settings_provider.h"
 #include "chromeos/settings/timezone_settings.h"
 #include "third_party/icu/source/i18n/unicode/timezone.h"
 
 namespace base {
 class StringValue;
 }
 
 namespace chromeos {
 
 class SystemSettingsProvider : public CrosSettingsProvider,
                                public system::TimezoneSettings::Observer {
  public:
   explicit SystemSettingsProvider(const NotifyObserversCallback& notify_cb);
-  virtual ~SystemSettingsProvider();
+  ~SystemSettingsProvider() override;
 
   // CrosSettingsProvider implementation.
-  virtual const base::Value* Get(const std::string& path) const override;
-  virtual TrustedStatus PrepareTrustedValues(
-      const base::Closure& callback) override;
-  virtual bool HandlesSetting(const std::string& path) const override;
+  const base::Value* Get(const std::string& path) const override;
+  TrustedStatus PrepareTrustedValues(const base::Closure& callback) override;
+  bool HandlesSetting(const std::string& path) const override;
 
   // TimezoneSettings::Observer implementation.
-  virtual void TimezoneChanged(const icu::TimeZone& timezone) override;
+  void TimezoneChanged(const icu::TimeZone& timezone) override;
 
  private:
   // CrosSettingsProvider implementation.
-  virtual void DoSet(const std::string& path,
-                     const base::Value& in_value) override;
+  void DoSet(const std::string& path, const base::Value& in_value) override;
 
   scoped_ptr<base::StringValue> timezone_value_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemSettingsProvider);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_SETTINGS_SYSTEM_SETTINGS_PROVIDER_H_