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This change makes the Nearby Share keyed service only start for
'PrimaryProfiles' on chromeos and adds some additional profile oriented
logging for debugging process manager profile issues.

Change-Id: If239b038627c343bbf5848e9a4ab1f5aed498f3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391905Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#804148}