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Ephemeral provider is added to the list of content settings sources that
are counted in site settings change counter.

Bug: 762560
Change-Id: I526f7280b61b4f777560c58a99cf5148bd9b9ff9
Reviewed-on: https://chromium-review.googlesource.com/1155603Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579355}