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This starts sending the actual payloads via NearbyConnectionsManager. It
is now only missing the connection to the PayloadTracker.

Bug: 1085067
Change-Id: I9c9ee61264799c62df13417c908bdaba82d1de3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366746
Commit-Queue: Richard Knoll <knollr@chromium.org>
Reviewed-by: Alex Chau <alexchau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800350}