toolchain-utils: fix missing-print-function lint warnings.

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

Change-Id: I2e0cf0d903b0ca7662132528ee6860ea8eaee83b
Reviewed-on: https://chrome-internal-review.googlesource.com/243412
Commit-Ready: Rahul Chaudhry <rahulchaudhry@google.com>
Tested-by: Rahul Chaudhry <rahulchaudhry@google.com>
Reviewed-by: Caroline Tice <cmtice@google.com>
27 files changed