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PrimaryAccountMutator is a new API that wraps the method related to the
mutation of the signed-in state of the primary account. It will become
the recommended API to set and clear the primary account when migrating
to the Identity Service API.

The PrimaryAccountMutatorImpl methods are not implemented yet. They
will be implemented in follow up CLs (and corresponding tests added).
This is done to limit the size of the CLs.

Design document is available at:
https://docs.google.com/document/d/1YVx-SW0VbrAnek69PVxQ1ie71VewcuKvf8JvIzFfuRQ/view

Bug: 889902
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I2acd1ebdccadfebb855e55f4e9b78c148557ed85
Reviewed-on: https://chromium-review.googlesource.com/c/1286852Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602467}