Fix Win10 hostname
Fix Win10 hostname

Grumble grumble... 15-character limit... grumble..

TBR=rmistry
BUG=skia:4235

Review URL: https://codereview.chromium.org/1406983006

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