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This CL fixes the CachedMetricsProfile and DemographicMetricsProvider
for ChromeOS Ash. It introduces a profile selection strategy for
CachedMetricsProfile and skips the number of profiles on disk check in
DemographicMetricsProvider for ChromeOS Ash.

Bug: 1145655
Change-Id: I3cf69673e428cc7ff81e4d1e5f1650a6d96bdcc2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527521Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Roger McFarlane <rogerm@chromium.org>
Reviewed-by: Vincent Boisselle <vincb@google.com>
Commit-Queue: Toby Huang <tobyhuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833819}