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Kerberos credentials manager should notify observers exactly once when it
finishes adding a list of accounts. This CL removes the flag that was
blocking notifications in case of failure because, even in this cases,
managed accounts might have been added and observers should be notified.

Change-Id: Idf07f4f755cc5f81aa1788f28c416bfed0fec106
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1878251
Commit-Queue: Felipe Andrade <fsandrade@chromium.org>
Reviewed-by: Lutz Justen <ljusten@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709435}