Mark pkg/intl/test/date_time_format_http_request_test as slow.

Mark pkg/intl/test/date_time_format_http_request_test as slow.

The additional nit capitalizations of markers has no semantic meaning, just for consistency.
Committed: https://code.google.com/p/dart/source/detail?r=13101

[Mads Ager (google), 2012-10-02 06:32:23]

LGTM, at least that will help us figure out if this test is sometimes taking a
bit longer or if it is in fact hanging.

[Alan Knight, 2012-10-02 16:38:18]

LGTM with one nit.

https://codereview.chromium.org/11037014/diff/1/pkg/pkg.status
File pkg/pkg.status (right):

https://codereview.chromium.org/11037014/diff/1/pkg/pkg.status#newcode44
pkg/pkg.status:44: intl/test/date_time_format_http_request_test: Slow
Nit that putting this test here matches the condition, but doesn't agree with
the comment. It would be better to modify the comment to explain why it's there
or to put it under a separate condition with a different comment.