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Changes FakeKerberosClient's internal storage from a map to a vector,
so the order in which accounts are added is preserved. Also remembers
whether the login password was used.

BUG=chromium:952240
TEST=Manually tested on Linux desktop

Change-Id: Icfb576e3f54f97cdb849b41ea6dd8fa49b3101ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1674084
Commit-Queue: Lutz Justen <ljusten@chromium.org>
Auto-Submit: Lutz Justen <ljusten@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#673354}