Improve Python-3 compatibility of download_from_google_storage.py
Improve Python-3 compatibility of download_from_google_storage.py

xrange doesn't exist in Python 3 and only nominally improves
memory usage on a value as small as MAX_TRIES.

Change-Id: I1e7408a05de880fee293466b1548c7f35e926270
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2246611
Commit-Queue: Edward Lesmes <d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org>
Reviewed-by: Edward Lesmes <d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools