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Calling |on_disconnected_| is necessary for detecting remote-initiated
disconnects, but for local-initiated disconnects, the code responsible
for disconnecting is already doing its own cleanup - notifying it of its
own action causing a disconnect is unnecessary.

Change-Id: I7ee7cf35140517f7849c30de704bd1a1fda62566
Reviewed-on: https://chromium-review.googlesource.com/c/1460199
Commit-Queue: Sam McNally <sammc@chromium.org>
Commit-Queue: Sergei Datsenko <dats@chromium.org>
Auto-Submit: Sam McNally <sammc@chromium.org>
Reviewed-by: Sergei Datsenko <dats@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630163}