Work around issue 9252 in scheduled_test and pkg/http.
Work around issue 9252 in scheduled_test and pkg/http.

Review URL: https://codereview.chromium.org//12540010

git-svn-id: a962b240025cf0577aa172e20f49ccb159ba6be1@20187 260f80e4-7a28-3924-810f-c04153c831b5

cjkao/dart-pub,dart-lang/pub,dart-lang/pub,maxwellpeterson-wf/pub,computmaxer/pub