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For every account available in the account tracker service, both the
Gaia ID and the email are available. The GCM AccountTracker was fetching
again the gaia ID from the server on every start-up and every time a new
account was added to the profile. This CL removes this useless fetch
and changed the GCM AccountTracker to reuse the information already
available in the IdentityManager.

Additional clean-up to completely remove the GCM AccountTracker would
also be good, but I do not know this code well enough to do this cleanup.

Fixed: 1028522

Change-Id: I77790a3203a94ea8c7baf19ca0eb2449b096b630
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1944492Reviewed-by: Colin Blundell <blundell@chromium.org>
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720515}