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Make entity tracker's lifetime same as initial sync done. The tracker
won't exist if we still have no data from the server.

In this patch also authentication_account_id is not set explicitly for
metadata coming from ModelReadyToSync. The behavior for this field
becomes similar to cache_guid. If authentication_account_id differs from
activation request then the metadata will be reset. Generally it should
not affect anything.

In the next patch unittests will be added.

Bug: 947044
Change-Id: I34a75006d1f31888f8ca485a94538b6dd98923c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2038733
Commit-Queue: Rushan Suleymanov <rushans@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750920}