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The default search engine can be disabled by enterprise. In this case,
we restore the permission settings for the old DSE. We also delete the
underlying pref that tracks settings, so that if the DSE is re-enabled,
the DSE permissions will be re-initialized for the new DSE as if being
initialized for the first time.

Bug: 780344
Change-Id: I6df13d6b085dbe8164fe003c3406245e5b8efb2f
Reviewed-on: https://chromium-review.googlesource.com/765566
Commit-Queue: Raymes Khoury <raymes@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521278}