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Adds the "browser_switcher.use_ie_sitelist" boolean pref. When set to
true, BrowserSwitcherService will download IE's sitelist after 60s.

Once the sitelist XML is downloaded, the rules are parsed and applied.

Bug: 884837
Change-Id: Ib7a6c374526c56c42265187667ea2d6febc3628b
Reviewed-on: https://chromium-review.googlesource.com/c/1286288
Commit-Queue: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603582}