Fix slave_hosts_cfg_test
Fix slave_hosts_cfg_test

I had rebased https://codereview.chromium.org/421053007 onto https://codereview.chromium.org/425073002/, but that was reverted and the original never changed back.

TBR=rmistry,epoger
BUG=skia:

Author: borenet@google.com

Review URL: https://codereview.chromium.org/429313003

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot