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Changes AccountManagerAsh to use ReceiverSet instead of a single
Receiver. This allows having multiple clients talking to the same
AccountManagerAsh instance and also prepares the upcoming unification of
AccountManagerFacade implementations. AccountManagerAsh ownership will
be revised in subsequent CLs.

Bug: 1161699, 1148448
Change-Id: Ida66bce494df802bf5ce4fd99f78d081a9540b95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2614788Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841428}