git-cl: Fix Change object construction for git-cl split
git-cl: Fix Change object construction for git-cl split

Changelist.GetChange signature was changed in
https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2038050

Bug: 1042324, 1054880
Change-Id: I6ba63e7f2f6c13bd8e8bef4e76cd66ee0525bba2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2067623
Reviewed-by: Josip Sokcevic <4606aec58cba917397ff2e4738f995e4758694f8@google.com>
Commit-Queue: Edward Lesmes <d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools