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We never want to explicitly close a Channel endpoint until after the
corresponding child process is dead. This prevents that from happening
in some cases where it's still possible today.

TBR=dcheng@chromium.org

Bug: 859386,861607,863430
Change-Id: I2858b6e011e06a000ae976c1e6ae96595cf67a85
Reviewed-on: https://chromium-review.googlesource.com/1135712
Commit-Queue: Ken Rockot <rockot@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575115}