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ChannelState was invented in order to address synchronous IPC failures.
As mojo doesn't have such synchronous failures, we can remove it to
simplify the code.

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: Ia4e5c57c65b0f431a6770fa29bd71b706c15479d
Reviewed-on: https://chromium-review.googlesource.com/1004072
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549489}