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This CL makes ProfileDownloader use AccessTokenFetcher in
kWaitUntilAvailable mode, which simplifies it as it doesn't need
to observe OnRefreshTokenUpdatedForAccount().

This is a follow-up CL of https://crrev.com/c/1436780.

Bug: 922757, 922758
Change-Id: If2b664a6e4e303db16cf028b947592e2f463c291
Reviewed-on: https://chromium-review.googlesource.com/c/1457575Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Julie Jeongeun Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#629912}