Ajax: remove deprecated extensions from ajax promise

(cherry-picked from 9d1b989f20b550af3590691723b0620f6914626e)
Fixes gh-2084
Closes gh-2092

src/ajax.js

@@ -488,9 +488,7 @@ jQuery.extend({
 			};
 
 		// Attach deferreds
-		deferred.promise( jqXHR ).complete = completeDeferred.add;
-		jqXHR.success = jqXHR.done;
-		jqXHR.error = jqXHR.fail;
+		deferred.promise( jqXHR );
 
 		// Remove hash character (#7531: and string promotion)
 		// Add protocol if not provided (prefilters might expect it)
@@ -620,9 +618,9 @@ jQuery.extend({
 		strAbort = "abort";
 
 		// Install callbacks on deferreds
-		for ( i in { success: 1, error: 1, complete: 1 } ) {
-			jqXHR[ i ]( s[ i ] );
-		}
+		completeDeferred.add( s.complete );
+		jqXHR.done( s.success );
+		jqXHR.fail( s.error );
 
 		// Get transport
 		transport = inspectPrefiltersOrTransports( transports, s, options, jqXHR );

test/unit/ajax.js

@@ -72,11 +72,11 @@ module( "ajax", {
 		},
 		success: true,
 		afterSend: function( request ) {
-			request.complete(function() {
+			request.always(function() {
 				ok( true, "complete" );
-			}).success(function() {
+			}).done(function() {
 				ok( true, "success" );
-			}).error(function() {
+			}).fail(function() {
 				ok( false, "error" );
 			});
 		}
@@ -90,11 +90,11 @@ module( "ajax", {
 		},
 		success: true,
 		complete: function( xhr ) {
-			xhr.complete(function() {
+			xhr.always(function() {
 				ok( true, "complete" );
-			}).success(function() {
+			}).done(function() {
 				ok( true, "success" );
-			}).error(function() {
+			}).fail(function() {
 				ok( false, "error" );
 			});
 		}