Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/filesystem/SyncCallbackHelper.h

Index: Source/modules/filesystem/SyncCallbackHelper.h
diff --git a/Source/modules/filesystem/SyncCallbackHelper.h b/Source/modules/filesystem/SyncCallbackHelper.h
index ad39e1c636c7705971dd67bd2a153d32a9866fb4..1d91f4023b139cfaa2d12e893dedb93325858c00 100644
--- a/Source/modules/filesystem/SyncCallbackHelper.h
+++ b/Source/modules/filesystem/SyncCallbackHelper.h
@@ -104,7 +104,7 @@ public:
     PassOwnPtr<ErrorCallback> errorCallback() { return ErrorCallbackImpl::create(this); }
 
 private:
-    class SuccessCallbackImpl : public SuccessCallback {
+    class SuccessCallbackImpl FINAL : public SuccessCallback {
     public:
         static PassOwnPtr<SuccessCallbackImpl> create(HelperType* helper)
         {
@@ -129,14 +129,14 @@ private:
         HelperType* m_helper;
     };
 
-    class ErrorCallbackImpl : public ErrorCallback {
+    class ErrorCallbackImpl FINAL : public ErrorCallback {
     public:
         static PassOwnPtr<ErrorCallbackImpl> create(HelperType* helper)
         {
             return adoptPtr(new ErrorCallbackImpl(helper));
         }
 
-        virtual void handleEvent(FileError* error)
+        virtual void handleEvent(FileError* error) OVERRIDE
         {
             ASSERT(error);
             m_helper->setError(error->code());