Fix GetPylint with USE_PYTHON3=True
Fix GetPylint with USE_PYTHON3=True

kwargs['stdin'] is passed in to subprocess communicate(), which
expects bytes, not str.

Bug: 1215602
Change-Id: I95326eed08cffecd31abc6b0380de2a3c2ff3dd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2929386
Reviewed-by: Josip Sokcevic <4606aec58cba917397ff2e4738f995e4758694f8@google.com>
Commit-Queue: Dan H <2e8715460253355fb9e8bf01cf6fb682a6fd4c62@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools