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This changes the code such that when the DSE has been disabled by
enterprise policy and is then re-enabled, we revert the DSE setting to
BLOCK. We only do this if the origin that is becoming the DSE wasn't
previously granted permission.

Bug: 799534
Change-Id: I9a061262e6e2886ff04ffa97e487ff0eb200d892
Reviewed-on: https://chromium-review.googlesource.com/812588
Commit-Queue: Raymes Khoury <raymes@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523614}