GitLab

Similar to crrev.com/c/2562799, we remove the installer factory and move
it to the omni-service.

Bug: b/170596931
Change-Id: I182816dba38fd66d116a1d066d414d69b1503c7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567276
Commit-Queue: Nic Hollingum <hollingum@google.com>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833523}