Revert "git-cl: Fix some python3 compatibility errors."

This reverts commit c87ed606.

Reason for revert: 
Causes a regressions for CL descriptions on Windows

Original change's description:
> git-cl: Fix some python3 compatibility errors.
> 
> Also, fix bug in git cl status where the 'updated' field was used to compare messages, even though
> it doesn't exist (see [1]). This CL modifies it to use 'date', which does exist.
> 
> [1] https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#change-message-info
> 
> Bug: 1002209
> Change-Id: I5a5e1193b8502c3ad35d94808ea178cad7f44ac6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1891259
> Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
> Reviewed-by: Anthony Polito <apolito@google.com>

TBR=ehmaldonado@chromium.org,apolito@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1002209
Change-Id: I004f202b12c6b99cb6b24cb12a14fba7898569e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1898547Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>