Fix zero padding in Gerrit ref
Fix zero padding in Gerrit ref

BUG=skia:

Change-Id: Id087c5a9b6dbb4cf0ae42b614d6ff9caf55c611a
Reviewed-on: https://skia-review.googlesource.com/4490
Reviewed-by: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@chromium.org>
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>

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