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These metrics are currently prefixed with "Nearby.Share". Nearby Share
is an application that depends on the Nearby Connections library. In
reality, these metrics actually instrument an implementation of the
Nearby Connections library, not an application like Nearby Share,
and should instead be prefixed with "Nearby.Connections".

This mistake was made because this logic resides in a 'nearby_sharing'
directory, which is an unfortunate historical artifact. All of this
logic needs to eventually be migrated to a more generic location,
but more urgently, these metrics need to be migrated to their correct
prefix.

The previous metrics, prefixed with "Nearby.Share", have only been
deployed to dev-channel, for a week, and will never be used, so I have
not applied aa 'obsolete' label to them, opting instead to outright
remove them.

Bug: 1123172
Change-Id: Ia22407469f4bc9a7f84813c17e37a5ce5d888624
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580907Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Josh Nohle <nohle@chromium.org>
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835337}