crosperf: fix three trival unitttest failures.

BUG=chromium:567883
TEST=these three test passes.

Change-Id: Ia8692cdee660802450d528d40c9a6b457a1cba31
Reviewed-on: https://chrome-internal-review.googlesource.com/241176
Commit-Ready: Yunlian Jiang <yunlian@google.com>
Tested-by: Yunlian Jiang <yunlian@google.com>
Reviewed-by: Caroline Tice <cmtice@google.com>
3 files changed