We deleted this in chromite back in 2013.  Looks like we forgot to
clean up depot_tools.

Bug: 216050
Change-Id: I7e7591aaa319ab1aeb7cc3f34e33b313b5029257
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2812199Reviewed-by: Stephane Belmon <sbelmon@google.com>
Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Josip Sokcevic <sokcevic@google.com>