Thread: Where are the icon classes for the sidebar?

Where are the icon classes for the sidebar?

I'm trying to create a sidebar menu item for the DeleteMe plugin called Delete Account. I've created an icon for it and I want to assign a class. What file in the Vantage theme has all of the class assignments? I specifically need to know where the items below are defined:

<li class="edit-profile"> ... </li>
<li class="add-listings"> ... </li>

etc.