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When signin cookies are cleared, then related data like the opt-in for
using the account-scoped password storage should be cleared too.
This CL implements that by adding a function
ClearAccountStorageSettingsForAllUsers() and calling it at the
appropriate times (i.e.
IdentityManager::Observer::OnAccountsCookieDeletedByUserAction).
(This is analogous to autofill::prefs::ClearSyncTransportOptIns().)

Bug: 1052005
Change-Id: I9a1c628900b8d64573ff0eec206f151a4a128abb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062278
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742737}