Revert "Ajax: Fix #14424. Use ActiveX in IE9+ on local files, close gh-1434."

This reverts commit 498e0e6c.

We can't use the ActiveX XHR because it doesn't support events.

src/.jshintrc

@@ -20,7 +20,6 @@
 	"globals": {
 		"jQuery": true,
 		"define": true,
-		"module": true,
-		"ActiveXObject": true
+		"module": true
 	}
 }

src/ajax/xhr.js

@@ -5,14 +5,6 @@ define([
 ], function( jQuery, support ) {
 
 jQuery.ajaxSettings.xhr = function() {
-	// Support: IE9+
-	// IE can't get local files with standard XHR, only ActiveX
-	if ( this.isLocal ) {
-		try {
-			return new ActiveXObject( "Microsoft.XMLHTTP" );
-		} catch( e ) {}
-	}
-
 	try {
 		return new XMLHttpRequest();
 	} catch( e ) {}