toolchain-utils: fix attribute-defined-outside-init lint errors.

BUG=chromium:570458
TEST='crosperf/run_tests.sh' passes.

Change-Id: If8c79fa74f30c40a67a9f0dee855a38d3e3a9c46
Reviewed-on: https://chrome-internal-review.googlesource.com/246491
Commit-Ready: Rahul Chaudhry <rahulchaudhry@google.com>
Tested-by: Rahul Chaudhry <rahulchaudhry@google.com>
Reviewed-by: Caroline Tice <cmtice@google.com>
5 files changed