toolchain-utils: remove unused variables.

This CL fixes all unused-variable lint warnings.

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

Change-Id: I4f38ca9a428738125b09dc38b4ad8778dab77886
Reviewed-on: https://chrome-internal-review.googlesource.com/243119
Commit-Ready: Rahul Chaudhry <rahulchaudhry@google.com>
Tested-by: Rahul Chaudhry <rahulchaudhry@google.com>
Reviewed-by: Luis Lozano <llozano@chromium.org>
4 files changed