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There was a race condition in the network service where if a disconnect
on the writing or reading data pipes was detected before the disconnect
on the mojo interfaces it would fail to send a close frame. To fix, stop
resetting the connection when the data pipes are closed.

Re-enable the SendCloseFrameWhenTabIsClosed browser test. It should no
longer be flaky, and it's the only test we have for this behaviour.

Also modify the SendCloseFrameWhenTabIsClosed test to no longer timeout
on failure.

BUG=1123349

Change-Id: Ib4aaa46cb1f9f97e09509f59ef421228d02c941d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398036
Commit-Queue: Adam Rice <ricea@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810463}