Prom: clean up config file.
Prom: clean up config file.

BUG=skia:

Change-Id: I2077ff515c6f3551f0ec64e96e64e77b03ce0c9d
Reviewed-on: https://skia-review.googlesource.com/6610
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@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