crosperf: fix lint warning.

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

Change-Id: I23820750a7eb970187bbf11a82b7e41c6c9aaf7d
Reviewed-on: https://chrome-internal-review.googlesource.com/241490
Commit-Ready: Yunlian Jiang <yunlian@google.com>
Tested-by: Yunlian Jiang <yunlian@google.com>
Reviewed-by: Caroline Tice <cmtice@google.com>
1 file changed