Clearing event handlers on unload is no longer necessary in any version of IE....

Clearing event handlers on unload is no longer necessary in any version of IE. This issue causing memory leaks between pages was fixed in MS07-033.

src/event.js

@@ -1177,21 +1177,4 @@ jQuery.each( ("blur focus focusin focusout load resize scroll unload click dblcl
 	}
 });
 
-// Prevent memory leaks in IE
-// Window isn't included so as not to unbind existing unload events
-// More info:
-//  - http://isaacschlueter.com/2006/10/msie-memory-leaks/
-if ( window.attachEvent && !window.addEventListener ) {
-	jQuery(window).bind("unload", function() {
-		for ( var id in jQuery.cache ) {
-			if ( jQuery.cache[ id ].handle ) {
-				// Try/Catch is to handle iframes being unloaded, see #4280
-				try {
-					jQuery.event.remove( jQuery.cache[ id ].handle.elem );
-				} catch(e) {}
-			}
-		}
-	});
-}
-
 })( jQuery );