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This adds more tests to SearchPermissionsService to test:
-The cases where the kGrantNotificationsToDSE flag is disabled
-The case where the kGrantNotificationsToDSE is enabled and then changes
back to disabled.

This also fixes a bug where resetting DSE notifications permissions
would happen even when the feature flag was disabled.

Bug: 799534
Change-Id: I907f03308936a1a502fa9fba04aae80325c3a3ee
Reviewed-on: https://chromium-review.googlesource.com/813140Reviewed-by: Ben Wells <benwells@chromium.org>
Commit-Queue: Raymes Khoury <raymes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522362}