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Refactor is necessary so that we can have more Prefs binders than Settings
binders when we have multi-profile.  Making this change removes the
refcounting logic that we had and allows the two binders to be owned
by different classes.

Bug: chromium:1015949
Change-Id: Icd341c511d31c7a2742bd50343726718262f5dad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1935414Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Commit-Queue: Sean Kau <skau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720758}