Revert "Update DEP actions for Python 3" This reverts commit e44595f2297d849115a8fcb52428420dd5756ea3. Reason for revert: build/mac_toolchain.py still fails with my local Python 3.9. Let's not make this change until the top level Chromium DEPS file does. Original change's description: > Update DEP actions for Python 3 > > build/mac_toolchain.py was fixed for Python 3 in > https://crrev.com/c/2727724 > > Bug: angleproject:5707 > Change-Id: I2f233157bedc3cc298250b8efc9bd68ac45cdc28 > Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2731707 > Reviewed-by: Jamie Madill <jmadill@chromium.org> > Commit-Queue: Jamie Madill <jmadill@chromium.org> Bug: angleproject:5707 Change-Id: Ib955a6343d886d273d7e949815fba5366b169386 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2753335 Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com> Commit-Queue: James Darpinian <jdarpinian@chromium.org>