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

net/proxy/proxy_config_service_android.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 NET_PROXY_PROXY_CONFIG_SERVICE_ANDROID_H_
 #define NET_PROXY_PROXY_CONFIG_SERVICE_ANDROID_H_
 
 #include <string>
 
 #include "base/android/jni_android.h"
@@ skipping 41 matching lines @@
 
     // Called from Java (on JNI thread) to signal that the proxy settings have
     // changed. New proxy settings are fetched from the system property store.
     virtual void ProxySettingsChanged(JNIEnv*, jobject) = 0;
   };
 
   ProxyConfigServiceAndroid(
       const scoped_refptr<base::SequencedTaskRunner>& network_task_runner,
       const scoped_refptr<base::SequencedTaskRunner>& jni_task_runner);
 
-  virtual ~ProxyConfigServiceAndroid();
+  ~ProxyConfigServiceAndroid() override;
 
   // Register JNI bindings.
   static bool Register(JNIEnv* env);
 
   // Android provides a local HTTP proxy that does PAC resolution. When this
   // setting is enabled, the proxy config service ignores the PAC URL and uses
   // the local proxy for all proxy resolution.
   void set_exclude_pac_url(bool enabled);
 
   // ProxyConfigService:
   // Called only on the network thread.
-  virtual void AddObserver(Observer* observer) override;
-  virtual void RemoveObserver(Observer* observer) override;
-  virtual ConfigAvailability GetLatestProxyConfig(ProxyConfig* config) override;
+  void AddObserver(Observer* observer) override;
+  void RemoveObserver(Observer* observer) override;
+  ConfigAvailability GetLatestProxyConfig(ProxyConfig* config) override;
 
  private:
   friend class ProxyConfigServiceAndroidTestBase;
   class Delegate;
 
   // For tests.
   ProxyConfigServiceAndroid(
       const scoped_refptr<base::SequencedTaskRunner>& network_task_runner,
       const scoped_refptr<base::SequencedTaskRunner>& jni_task_runner,
       GetPropertyCallback get_property_callback);
 
   // For tests.
   void ProxySettingsChanged();
 
   scoped_refptr<Delegate> delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyConfigServiceAndroid);
 };
 
 } // namespace net
 
 #endif // NET_PROXY_PROXY_CONFIG_SERVICE_ANDROID_H_