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This class can listen for prefs changes, and pre-compute/convert types
for the BrowserSwitcher prefs. It also checks whether the prefs are
managed or not, and offers getters to conveniently access the prefs.

Change-Id: I64a218f10e30193b8a322c49f1ae08feaf80a128
Reviewed-on: https://chromium-review.googlesource.com/c/1393450
Commit-Queue: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619993}