Change regression test now that String does have operator*.

It still doesn't work for string arguments, but that's a type/argument error.

Review URL: https://codereview.chromium.org//173543002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@32845 260f80e4-7a28-3924-810f-c04153c831b5

tests/compiler/dart2js_extra/regress/4492_test.dart

@@ -12,5 +12,6 @@ class A {
   }
 }
 
-main() => Expect.throws(() => new A().x(1, 2),
-                        (e) => e is NoSuchMethodError);
+main() {
+  Expect.throws(() => new A().x(1, 2));
+}