Dialog: Remove animation stopping in destroy

Effects wrappers are no longer used, so the workaround and test are no
longer necessary.

This fixes tests in IE8 with jQuery 1.7.

Effectively a complete revert of 13505e5

Closes gh-1481

Author: scottgonzalez

tests/unit/dialog/dialog.html

@@ -22,7 +22,6 @@
 			"ui/button.js",
 			"ui/effect.js",
 			"ui/effect-blind.js",
-			"ui/effect-clip.js",
 			"ui/effect-explode.js",
 			"ui/dialog.js"
 		]

tests/unit/dialog/dialog_options.js

@@ -283,15 +283,6 @@ test("height", function() {
 	element.remove();
 });
 
-asyncTest( "hide, #5860 - don't leave effects wrapper behind", function() {
-	expect( 1 );
-	$( "#dialog1" ).dialog({ hide: "clip" }).dialog( "close" ).dialog( "destroy" );
-	setTimeout(function() {
-		equal( $( ".ui-effects-wrapper" ).length, 0 );
-		start();
-	}, 500);
-});
-
 test("maxHeight", function() {
 	expect(3);
 

ui/dialog.js

@@ -168,7 +168,7 @@ return $.widget( "ui.dialog", {
 			// Without detaching first, the following becomes really slow
 			.detach();
 
-		this.uiDialog.stop( true, true ).remove();
+		this.uiDialog.remove();
 
 		if ( this.originalTitle ) {
 			this.element.attr( "title", this.originalTitle );