I need to disable these checkboxes below comments from in one other wordpress blog.
Notify me of follow-up comments by email.
Notify me of new posts by email.
I figured out that these are apart of Jetpack plugin here. but Jetpack has lot of features and its settings. These setting can be found under dashboard->Settings->discussion->Under Jetpack Subscriptions Settings – disable follow blog and follow comments settings.
That is it. These two checkboxes will clear from the comments form.