Create an IdentityManager::RegisterProfilePrefs method.

Bug: 939372
Change-Id: Ia6a248ce8b3cab11cd285c2addc96cbf3eaa905f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1529065
Commit-Queue: Lowell Manners <lowell@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644246}
9 files changed