This reverts commit 4c54361841.
Reason for revert: Reland with a fix.
Find https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6173762/1..2
Tested by running presubmit_support.py --generate_diff
Original change's description:
> Revert "add support for -U in presubmit_diff.py"
>
> This reverts commit b576ab3b78.
>
> Reason for revert: http://b/389876151
>
> Original change's description:
> > add support for -U in presubmit_diff.py
> >
> > presubmit_diff.py is going to be used to compute the changes to be
> > formatted, and -U helps minimize the number of irrelevant lines
> > from formatting.
> >
> > Bug: 379902295
> > Change-Id: I9c0a2ee6b5ffa6b9fe4427362556020d525f1105
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6168707
> > Reviewed-by: Gavin Mak <gavinmak@google.com>
> > Commit-Queue: Scott Lee <ddoman@chromium.org>
>
> Bug: 379902295
> Change-Id: I82dd707e5ae3d4b1760e632506ee0e1bc1d76e09
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6173760
> Reviewed-by: Scott Lee <ddoman@chromium.org>
> Commit-Queue: Gavin Mak <gavinmak@google.com>
> Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bug: 379902295
Change-Id: Icbc4aa98bbfaa816143be064217fb2d992b48baf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6173762
Reviewed-by: Gavin Mak <gavinmak@google.com>
Commit-Queue: Scott Lee <ddoman@chromium.org>
