depot_tools: Fix bug when running download_from_google on Python 3.
depot_tools: Fix bug when running download_from_google on Python 3.

Issue caused by utf-8 vs byte mismatch in python 3.

Bug: 1009698
Change-Id: I8ab6b129ea9ab18f06f8ff4eb5da3aa018829365
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1832773
Commit-Queue: Edward Lesmes <d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org>
Reviewed-by: Anthony Polito <05bb588aa9020353543fee7ac4e6e0a3d0d6f6ed@google.com>

CoherentLabs/depot_tools,CoherentLabs/depot_tools