Avoid using multitest.

This test did not work as a multitest, because the
deferred_redirecting_factory_lib1.dart imports the main file - it will not
find it after the splitting and renaming.

Luckily it is not strictly required for the test (though somewhat cleaner)
to have a multitest.

BUG=

Review URL: https://codereview.chromium.org//1127023003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@45643 260f80e4-7a28-3924-810f-c04153c831b5

tests/language/deferred_redirecting_factory_test.dart

@@ -40,9 +40,9 @@ test3() async {
 
 
 test() async {
-  await test1(); /// 01: ok
-  await test2(); /// 02: ok
-  await test3(); /// 03: ok
+  await test1();
+  await test2();
+  await test3();
 }
 
 void main() {

tests/language/language.status

@@ -28,8 +28,7 @@ conditional_property_assignment_test: Fail
 conditional_property_access_test: Fail
 conditional_method_invocation_test: Fail
 
-deferred_redirecting_factory_test/02: Fail # Issue 23408
-deferred_redirecting_factory_test/03: Fail # Issue 23408
+deferred_redirecting_factory_test: Fail # Issue 23408
 [ $compiler == none ]
 # Non-contractive types are not supported in the vm.
 cyclic_type_test/02: Fail, OK