GitLab

Passed PrefRegistry and PrefRegistrySyncable by raw pointer instead of reference
to scoped_ptr. PrefRegistry and PrefRegistrySyncable have an internal reference
count. There is no need to use a double indirection when passing them around.

Used base::MakeRefCounted instead of naked 'new' operator.

Change-Id: I53a0fdfc99b7ef3dd32b191664520659c2585fa5
Reviewed-on: https://chromium-review.googlesource.com/892582Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: François Degros <fdegros@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533087}