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

base/message_loop/message_pump_android.h

Index: base/message_loop/message_pump_android.h
diff --git a/base/message_loop/message_pump_android.h b/base/message_loop/message_pump_android.h
index 9b4540f6ff95fa8c9361a58ee2d63de86d4e8724..d48050d21d10aca84d08c7f685413750dd40aa84 100644
--- a/base/message_loop/message_pump_android.h
+++ b/base/message_loop/message_pump_android.h
@@ -22,12 +22,12 @@ class TimeTicks;
 class BASE_EXPORT MessagePumpForUI : public MessagePump {
  public:
   MessagePumpForUI();
-  virtual ~MessagePumpForUI();
+  ~MessagePumpForUI() override;
 
-  virtual void Run(Delegate* delegate) override;
-  virtual void Quit() override;
-  virtual void ScheduleWork() override;
-  virtual void ScheduleDelayedWork(const TimeTicks& delayed_work_time) override;
+  void Run(Delegate* delegate) override;
+  void Quit() override;
+  void ScheduleWork() override;
+  void ScheduleDelayedWork(const TimeTicks& delayed_work_time) override;
 
   virtual void Start(Delegate* delegate);