I took this out in https://github.com/edx/edx-platform/commit/3813e51cfbb684c1a7b5efd93378eeec5a5a71e8

This was a wrapper that popped up a confirm box to ask a question of the user. I took that out so that I could do some preprossessing of the input (ie check if the username or problem name isn't "") before popping up the confirmation box. Ideally an extension of the dash would extend that preprocessing to include checking that the user and problem are valid before actually asking if we want to clear the data (we don't currently handle invalid inputs very well - we just return the same error message no matter what happened).