To remove the profile picture row of the table (which includes the gravatar link):
jQuery( "tr.user-profile-picture" ).remove();
To remove that entire “about yourself” table:
jQuery( "tr.user-profile-picture" ).parents("table:first").remove();
Use this type of jQuery call, don’t try to get fancy with the loop.
This is on WP 4.4; earlier versions may have different HTML class names for those elements.