Actually avoid timing out when running "pub lish".
Actually avoid timing out when running "pub lish".

R=rnystrom@google.com
BUG=18180

Review URL: https://codereview.chromium.org//270403002

git-svn-id: a962b240025cf0577aa172e20f49ccb159ba6be1@35927 260f80e4-7a28-3924-810f-c04153c831b5

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