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IdentityManagerFactoryObserver is a parallel interface to //ios/chrome's
SigninManagerFactoryObserver. It will be used to replace usage of
that observer in follow up CLs.

BUG=927343

hange-Id: I5d32caf0fa0c24b692b6d5ccaf6f8d191818fd74
Change-Id: I801a883aa72ee69e3686fff58ddd4b5c893c799c
Reviewed-on: https://chromium-review.googlesource.com/c/1448473
Auto-Submit: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#628325}