The module is called "Queue" in Python 2, and "queue" in Python 3. Use the
same try-ImportError check that's already present in some other files in
depot_tools to make both download_from_google_storage and
upload_to_google_storage work.

Bug: 1007872, 1009819
Change-Id: I8177cd251cbaf8313f41708036c4f36aa6d8bfe2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1859994
Auto-Submit: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>