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This change avoids a crash when NodeController::pending_broker_clients_
and NodeController::pending_invitations_ diverge. This might happen with
complex enough node topologies, where there is a node that proxies
invitations to a set of other nodes.

BUG=845709

Change-Id: Ia678f464fafb69628600ec00dac19da3b6868fe0
Reviewed-on: https://chromium-review.googlesource.com/1069728Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Luis Hector Chavez <lhchavez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560857}