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This is so PageInfoController, which will be componentized soon, can
continue to use CookieControlsObserver.
See https://chromium-review.googlesource.com/c/chromium/src/+/2151455 for
how I build upon this change.

Bug: 1052375
Change-Id: I156489282000e92b0a93d6abf5abb5c05d3d2918
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2152829
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760160}