crosperf: fix lint warning.

BUG=chromium:567921
TEST=settings_unittest.py is clean.

Change-Id: Id9ac86b7d07ece37f9e578550bdcde5084b573b6
Reviewed-on: https://chrome-internal-review.googlesource.com/241492
Commit-Ready: Yunlian Jiang <yunlian@google.com>
Tested-by: Yunlian Jiang <yunlian@google.com>
Reviewed-by: Caroline Tice <cmtice@google.com>
1 file changed