Ajax: move ajax event aliases to their own file

Fixes #15126

Gruntfile.js

@@ -38,7 +38,7 @@ module.exports = function( grunt ) {
 					"selector"
 				],
 				removeWith: {
-					ajax: [ "manipulation/_evalUrl" ],
+					ajax: [ "manipulation/_evalUrl", "event/ajax" ],
 					callbacks: [ "deferred" ],
 					css: [ "effects", "dimensions", "offset" ]
 				}

src/ajax.js

@@ -796,12 +796,5 @@ jQuery.each( [ "get", "post" ], function( i, method ) {
 	};
 });
 
-// Attach a bunch of functions for handling common AJAX events
-jQuery.each( [ "ajaxStart", "ajaxStop", "ajaxComplete", "ajaxError", "ajaxSuccess", "ajaxSend" ], function( i, type ) {
-	jQuery.fn[ type ] = function( fn ) {
-		return this.on( type, fn );
-	};
-});
-
 return jQuery;
 });

src/event/ajax.js

+define([
+	"../core",
+	"../event"
+], function( jQuery ) {
+
+// Attach a bunch of functions for handling common AJAX events
+jQuery.each( [ "ajaxStart", "ajaxStop", "ajaxComplete", "ajaxError", "ajaxSuccess", "ajaxSend" ], function( i, type ) {
+	jQuery.fn[ type ] = function( fn ) {
+		return this.on( type, fn );
+	};
+});
+
+});

src/jquery.js

@@ -23,6 +23,7 @@ define([
 	"./ajax/script",
 	"./ajax/jsonp",
 	"./ajax/load",
+	"./event/ajax",
 	"./effects",
 	"./effects/animatedSelector",
 	"./offset",