Update platform classes to use OVERRIDE / FINAL when needed

Source/platform/Timer.h

 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 88 matching lines @@
 #ifndef NDEBUG
     ThreadIdentifier m_thread;
 #endif
 
     friend class ThreadTimers;
     friend class TimerHeapLessThanFunction;
     friend class TimerHeapReference;
 };
 
 template <typename TimerFiredClass>
-class Timer : public TimerBase {
+class Timer FINAL : public TimerBase {
 public:
     typedef void (TimerFiredClass::*TimerFiredFunction)(Timer*);
 
     Timer(TimerFiredClass* o, TimerFiredFunction f)
         : m_object(o), m_function(f) { }
 
 private:
-    virtual void fired() { (m_object->*m_function)(this); }
+    virtual void fired() OVERRIDE { (m_object->*m_function)(this); }
 
     TimerFiredClass* m_object;
     TimerFiredFunction m_function;
 };
 
 inline bool TimerBase::isActive() const
 {
     ASSERT(m_thread == currentThread());
     return m_nextFireTime;
 }
 
 template <typename TimerFiredClass>
-class DeferrableOneShotTimer : private TimerBase {
+class DeferrableOneShotTimer FINAL : private TimerBase {
 public:
     typedef void (TimerFiredClass::*TimerFiredFunction)(DeferrableOneShotTimer*);
 
     DeferrableOneShotTimer(TimerFiredClass* o, TimerFiredFunction f, double delay)
         : m_object(o)
         , m_function(f)
         , m_delay(delay)
         , m_shouldRestartWhenTimerFires(false)
     {
     }
 
     void restart()
     {
         // Setting this boolean is much more efficient than calling startOneShot
         // again, which might result in rescheduling the system timer which
         // can be quite expensive.
 
         if (isActive()) {
             m_shouldRestartWhenTimerFires = true;
             return;
         }
         startOneShot(m_delay);
     }
 
     using TimerBase::stop;
     using TimerBase::isActive;
 
 private:
-    virtual void fired()
+    virtual void fired() OVERRIDE
     {
         if (m_shouldRestartWhenTimerFires) {
             m_shouldRestartWhenTimerFires = false;
             startOneShot(m_delay);
             return;
         }
 
         (m_object->*m_function)(this);
     }
 
     TimerFiredClass* m_object;
     TimerFiredFunction m_function;
 
     double m_delay;
     bool m_shouldRestartWhenTimerFires;
 };
 
 }
 
 #endif