Revert "Always use commit_id.py to generate commit.h" This reverts commit 4dc19c38c0c5e307350ecd8b9f80d59573161df9. Causes a git error during 'gn gen': fatal: this operation must be run in a work tree BUG=chromium:1055991,angleproject:2344 Change-Id: I74dd36d557dcaf1bd1b13264d806a1c6b09e1a56 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2073200 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>