[autoroll] Remove unsupported commit message features for gn -> chromium
[autoroll] Remove unsupported commit message features for gn -> chromium

We can't obtain a git log from a CIPD package.

Bug: skia:11712
Change-Id: I54f1184c331bfc05d388bbc8f7b197f2e206d274
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/383658
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot