This reverts commit 9f29465e.

Reason for revert:
line 2302, in CMDUploadChange
    change_id = change_ids[0]
IndexError: list index out of range

Original change's description:
> git-cl: Refactor CMDUploadChange
> 
> Changes:
> - Add _GetDescriptionForUpload and _GetTitleForUpload.
> - Add ensure_change_id to ChangeDescription, that ensures the
>   description has a particular Change-Id.
> - If more than a Change-Id was entered on new issue upload, remove
>   all, and add a new one.
> 
> Change-Id: I0eae474eb07ea3036973b18571f72a80da425b21
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2101811
> Reviewed-by: Josip Sokcevic <sokcevic@google.com>
> Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

TBR=ehmaldonado@chromium.org,apolito@google.com,infra-scoped@luci-project-accounts.iam.gserviceaccount.com,sokcevic@google.com

Change-Id: Ibb76539066c103ec951fa8d02684bc10f84549bf
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2103531Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>