Remove un-used keys.
Remove un-used keys.

Change-Id: Ifdbb5a53e72567193c6f4f104cbf2007b42c04c7
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/577977
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@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