[perf] Remove unused CSS.
[perf] Remove unused CSS.

Change-Id: I04a52ecc115d6110255f7e08aede050eb2d26a92
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/268820
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