fixup! Widget: Avoid tracking remove event handlers for classes options

Author: scottgonzalez

ui/widget.js

@@ -514,9 +514,9 @@ $.Widget.prototype = {
 			}
 		}
 
-		// Don't use ._on() because we want to avoid additional processing for
-		// tracking the event bindings.
-		options.element.one( "remove", $.proxy( this, "_untrackClassesElement" ) );
+		this._on( options.element, {
+			remove: "_untrackClassesElement"
+		} );
 
 		if ( options.keys ) {
 			processClassString( options.keys.match( /\S+/g ) || [], true );
@@ -535,6 +535,8 @@ $.Widget.prototype = {
 				that.classesElementLookup[ key ] = $( value.not( event.target ).get() );
 			}
 		} );
+
+		this._off( event.target );
 	},
 
 	_removeClass: function( element, keys, extra ) {