Landing pull request 554. #10531: Remove `layerX` and `layerY` Fixes #10531.

More Details:
 - https://github.com/jquery/jquery/pull/554
 - http://bugs.jquery.com/ticket/10531

src/event.js

@@ -486,7 +486,7 @@ jQuery.event = {
 	},
 
 	mouseHooks: {
-		props: "button buttons clientX clientY fromElement layerX layerY offsetX offsetY pageX pageY screenX screenY toElement wheelDelta".split(" "),
+		props: "button buttons clientX clientY fromElement offsetX offsetY pageX pageY screenX screenY toElement wheelDelta".split(" "),
 		filter: function( event, original ) {
 			var eventDoc, doc, body,
 				button = original.button,