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Assuming based on a small amount of evidence that there may be a bug
causing some ChannelAssociatedGroupController instances to leak, this CL
ensures that in such cases, the object's outgoing message queue will not
also leak.

Bug: 808725
Change-Id: I256dd264b811f9ccb8e8e3ee86f2b58f916f1560
Reviewed-on: https://chromium-review.googlesource.com/902813Reviewed-by: Yuzhu Shen <yzshen@chromium.org>
Commit-Queue: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534693}