Tooltip: Only bind remove handler for delegated tooltips

The remove handler was being added for every tooltip, but only removed for
delegated tooltips. The default destroy behavior already handles non-delegated
tooltips, so the handler should only be added for delegated tooltips.

Fixes #9531
Closes jquerygh-1156

Author: scottgonzalez

ui/jquery.ui.tooltip.js

@@ -310,11 +310,17 @@ $.widget( "ui.tooltip", {
 					fakeEvent.currentTarget = target[0];
 					this.close( fakeEvent, true );
 				}
-			},
-			remove: function() {
-				this._removeTooltip( tooltip );
 			}
 		};
+
+		// Only bind remove handler for delegated targets. Non-delegated
+		// tooltips will handle this in destroy.
+		if ( target[ 0 ] !== this.element[ 0 ] ) {
+			events.remove = function() {
+				this._removeTooltip( tooltip );
+			};
+		}
+
 		if ( !event || event.type === "mouseover" ) {
 			events.mouseleave = "close";
 		}
@@ -353,8 +359,9 @@ $.widget( "ui.tooltip", {
 
 		target.removeData( "ui-tooltip-open" );
 		this._off( target, "mouseleave focusout keyup" );
+
 		// Remove 'remove' binding only on delegated targets
-		if ( target[0] !== this.element[0] ) {
+		if ( target[ 0 ] !== this.element[ 0 ] ) {
 			this._off( target, "remove" );
 		}
 		this._off( this.document, "mousemove" );