[task scheduler] Fix application of Gerrit refs
[task scheduler] Fix application of Gerrit refs

BUG=skia:

Change-Id: I41047bc242084ca532eecea032d8ae8fd108d335
Reviewed-on: https://skia-review.googlesource.com/6949
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>
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