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If Chrome OS Account Manager
  - Has been fully initialized, and
  - Receives an initialization request with a callback,
that callback is never invoked.

Fix this by calling initialization callbacks instead of just early
exiting in the case of duplicate initialization requests.

Bug: 967602
Test: chromeos_components_unittests --gtest_filter="*AccountManager*Test*"
Change-Id: I2d072c50df158c81adc1be497c9891603ac52038
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1722532
Commit-Queue: Kush Sinha <sinhak@chromium.org>
Reviewed-by: Lutz Justen <ljusten@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682260}