Fix python2/3 compatibility in DownloadUsingHttp function
Fix python2/3 compatibility in DownloadUsingHttp function

Change-Id: I59ed965d066b7875c1739408054498b328652be5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2988315
Commit-Queue: Dirk Pranke <6693ee08b084bb2ffa767f664c99b689395e0e4b@google.com>
Reviewed-by: Dirk Pranke <6693ee08b084bb2ffa767f664c99b689395e0e4b@google.com>

CoherentLabs/depot_tools,CoherentLabs/depot_tools