GitLab

Adds a CallbackFactory that creates callback for each os hook, and
DCHECK on destruction to make sure that all os hooks type have created
callback.

Bug: 1129193
Change-Id: I82a44dc7fa8a1c40c7caba8fcaa6134620e80d4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517438
Commit-Queue: Phillis Tang <phillis@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826457}