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This change allows Mojo client processes to connect to a new process
network if disconnected from a previous one. Prior to this change, a
process could only belong to one network for its entire lifetime.

This new behavior is useful in cases where a client process may outlive
its original broker process (for example, if the broker crashes) and
should be able to continue operating normally when a new broker process
is established in the system.

Bug: 813112
Change-Id: Ifb5f16f1b39127cf7b469ee798f2d3da159fa432
Tbr: jam@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1821743Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Commit-Queue: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#700414}