crosperf: clean lint warnings.

BUG=chromium:567921
TEST=these files are lint clean.

Change-Id: I889c80bd4fa2b8f67f3e386c86b68e373574911a
Reviewed-on: https://chrome-internal-review.googlesource.com/241489
Commit-Ready: Yunlian Jiang <yunlian@google.com>
Tested-by: Yunlian Jiang <yunlian@google.com>
Reviewed-by: Caroline Tice <cmtice@google.com>
4 files changed