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This CL aligns CookieManager's interface for listening to cookie changes
(observer pattern) with the proposed addition to
RestrictedCookieManager, which will be used by the Async Cookies API.

Bug: 729800
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I0464b0d1d0388279e549d19c5dbeea2d0342cc60
Reviewed-on: https://chromium-review.googlesource.com/913151Reviewed-by: Randy Smith <rdsmith@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536944}