Removed errorThrown test for 404 responses seeing as Safari 3.x XHR sets the...

Removed errorThrown test for 404 responses seeing as Safari 3.x XHR sets the statusText as "OK" rather than "Not Found".

test/unit/ajax.js

@@ -242,7 +242,7 @@ test("jQuery.ajax() - error callbacks", function() {
 
 test("jQuery.ajax() - textStatus and errorThrown values", function() {
 
-	var nb = 3;
+	var nb = 2;
 
 	expect( 2 * nb );
 	stop();
@@ -253,6 +253,11 @@ test("jQuery.ajax() - textStatus and errorThrown values", function() {
 		}
 	}
 
+	/*
+	Safari 3.x returns "OK" instead of "Not Found"
+	Safari 4.x doesn't have this issue so the test should be re-instated once
+	we drop support for 3.x
+
 	jQuery.ajax({
 		url: url("data/nonExistingURL"),
 		error: function( _ , textStatus , errorThrown ){
@@ -261,6 +266,7 @@ test("jQuery.ajax() - textStatus and errorThrown values", function() {
 			startN();
 		}
 	});
+	*/
 
 	jQuery.ajax({
 		url: url("data/name.php?wait=5"),