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We always remove invitee from pending_invitations_ before adding it to
pending_broker_clients, so the old code actually is buggy and invitees
in pending_broker_clients_ will never be added as a broker client. Fix
it by checking peers_ instead of pending_invitations_.

BUG=b:146518063,b:150661600,b:168250032,chromium:1121709
TEST=manual - Keep running arc.Boot.vm with updated mojo code.

Change-Id: Ib0353944e7d5b9edc04947f8bd2db1442a4ed78d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2411560
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Auto-Submit: Lepton Wu <lepton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807076}