Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/quota/StorageErrorCallback.h

Index: Source/modules/quota/StorageErrorCallback.h
diff --git a/Source/modules/quota/StorageErrorCallback.h b/Source/modules/quota/StorageErrorCallback.h
index 5eced05cb60d254d6f0bdf1adbdf162c933000a8..ed72dda1eea747dc2c927400ac02253c4658c9ec 100644
--- a/Source/modules/quota/StorageErrorCallback.h
+++ b/Source/modules/quota/StorageErrorCallback.h
@@ -47,14 +47,14 @@ public:
     virtual ~StorageErrorCallback() { }
     virtual void handleEvent(DOMError*) = 0;
 
-    class CallbackTask : public ExecutionContextTask {
+    class CallbackTask FINAL : public ExecutionContextTask {
     public:
         static PassOwnPtr<CallbackTask> create(PassOwnPtr<StorageErrorCallback> callback, ExceptionCode ec)
         {
             return adoptPtr(new CallbackTask(callback, ec));
         }
 
-        virtual void performTask(ExecutionContext*);
+        virtual void performTask(ExecutionContext*) OVERRIDE;
 
     private:
         CallbackTask(PassOwnPtr<StorageErrorCallback>, ExceptionCode);