Update more core classes to use OVERRIDE / FINAL when needed

Source/core/rendering/RenderText.cpp

Index: Source/core/rendering/RenderText.cpp
diff --git a/Source/core/rendering/RenderText.cpp b/Source/core/rendering/RenderText.cpp
index 829758b217ec07f5586e868d935ac68a657925c0..9db3417190d9b752a50b0aeed5cc8b74c8d93199 100644
--- a/Source/core/rendering/RenderText.cpp
+++ b/Source/core/rendering/RenderText.cpp
@@ -66,7 +66,7 @@ class SecureTextTimer;
 typedef HashMap<RenderText*, SecureTextTimer*> SecureTextTimerMap;
 static SecureTextTimerMap* gSecureTextTimers = 0;
 
-class SecureTextTimer : public TimerBase {
+class SecureTextTimer FINAL : public TimerBase {
 public:
     SecureTextTimer(RenderText* renderText)
         : m_renderText(renderText)
@@ -84,7 +84,7 @@ public:
     unsigned lastTypedCharacterOffset() { return m_lastTypedCharacterOffset; }
 
 private:
-    virtual void fired()
+    virtual void fired() OVERRIDE
     {
         ASSERT(gSecureTextTimers->contains(m_renderText));
         m_renderText->setText(m_renderText->text().impl(), true /* forcing setting text as it may be masked later */);