Update WTF classes to use OVERRIDE / FINAL when needed

Source/wtf/Uint8ClampedArray.h

Index: Source/wtf/Uint8ClampedArray.h
diff --git a/Source/wtf/Uint8ClampedArray.h b/Source/wtf/Uint8ClampedArray.h
index 5e579b4e6cc7f619651e51ce684b021325200a95..9d864933b79134b523ae15d52eaefa105f45193d 100644
--- a/Source/wtf/Uint8ClampedArray.h
+++ b/Source/wtf/Uint8ClampedArray.h
@@ -33,7 +33,7 @@
 
 namespace WTF {
 
-class Uint8ClampedArray : public Uint8Array {
+class Uint8ClampedArray FINAL : public Uint8Array {
 public:
     static inline PassRefPtr<Uint8ClampedArray> create(unsigned length);
     static inline PassRefPtr<Uint8ClampedArray> create(const unsigned char* array, unsigned length);
@@ -54,7 +54,7 @@ public:
     inline PassRefPtr<Uint8ClampedArray> subarray(int start) const;
     inline PassRefPtr<Uint8ClampedArray> subarray(int start, int end) const;
 
-    virtual ViewType getType() const
+    virtual ViewType getType() const OVERRIDE
     {
         return TypeUint8Clamped;
     }