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With this change, if the user is logged into Chrome,
and unless authentication is disabled with
  --autofill-assistant-auth=false
the service will send out oauth credentials with the request.

This is one step towards making only authenticated calls.

Bug: 806868
Change-Id: I504a06af842869739ba44230d57f2a58259a480c
Reviewed-on: https://chromium-review.googlesource.com/c/1275890
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602354}