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IdentityManager has an iOS-specific ForceTriggerOnCookieChange() method.
This method makes more sense on AccountsCookieMutator, together with
other similar methods (e.g., TriggerCookieJarUpdate()).

This change came about while auditing the interface of
identity_manager.h.

Bug: 930582, 964235
Change-Id: I3a0d023e3f84831a26250177f657e7c2646b8e17
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1791147Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695144}