Reapply "Remove deprecated classes and functions in Date."

tests/standalone/io/http_headers_test.dart

Index: tests/standalone/io/http_headers_test.dart
diff --git a/tests/standalone/io/http_headers_test.dart b/tests/standalone/io/http_headers_test.dart
index f4df0053439a16fdef6df464ec491838de99c465..112bac2b994fa6f236107dd7c0438229d8753977 100644
--- a/tests/standalone/io/http_headers_test.dart
+++ b/tests/standalone/io/http_headers_test.dart
@@ -289,8 +289,7 @@ void testCookie() {
   Cookie cookie;
   cookie = new Cookie("name", "value");
   Expect.equals("name=value", cookie.toString());
-  TimeZone utc = new TimeZone.utc();
-  Date date = new Date.withTimeZone(2014, Date.JAN, 5, 23, 59, 59, 0, utc);
+  Date date = new Date(2014, Date.JAN, 5, 23, 59, 59, 0, isUtc: true);
   cookie.expires = date;
   checkCookie(cookie, "name=value"
                       "; Expires=Sun, 5 Jan 2014 23:59:59 GMT");