GitLab

Moves
- ForceSafeSearchPolicyHandler
- ForceYouTubeSafetyModePolicyHandler
- BrowsingHistoryPolicyHandler
- SecureOriginPolicyHandler
out of configuration_policy_handler_list_factory.cc to the places that
use the prefs. Merely a cleanup CL - no other changes.

BUG=chromium:872717
TEST=tryjobs

Change-Id: Ic234b0aac5f869abe9dcb99908d4ffb615bc4f2c
Reviewed-on: https://chromium-review.googlesource.com/1169173
Commit-Queue: Lutz Justen <ljusten@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584408}