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On low-end devices, BindInterface can be quite expensive. This CL
improves startup performance on low-end devices by using a single
PrefStoreRegistryPtr for all layered pref stores to be registered with
the pref service.

Bug: 654988
Change-Id: I1536f69f7c1a959cb41ed2b728e995b0d5f7eb17
Reviewed-on: https://chromium-review.googlesource.com/494368
Commit-Queue: Sam McNally <sammc@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#468938}