Update bindings classes to use OVERRIDE / FINAL when needed

Source/bindings/v8/V8MutationCallback.h

Index: Source/bindings/v8/V8MutationCallback.h
diff --git a/Source/bindings/v8/V8MutationCallback.h b/Source/bindings/v8/V8MutationCallback.h
index 93a4820998a22a44d8de76c92f95676195253778..743ea98e6a6fdb9d3d2dc28ef394669d9c52b747 100644
--- a/Source/bindings/v8/V8MutationCallback.h
+++ b/Source/bindings/v8/V8MutationCallback.h
@@ -39,7 +39,7 @@ namespace WebCore {
 
 class ExecutionContext;
 
-class V8MutationCallback : public MutationCallback, public ActiveDOMCallback {
+class V8MutationCallback FINAL : public MutationCallback, public ActiveDOMCallback {
 public:
     static PassOwnPtr<V8MutationCallback> create(v8::Handle<v8::Function> callback, ExecutionContext* context, v8::Handle<v8::Object> owner, v8::Isolate* isolate)
     {