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When the browser is controlled remotely over the pipe,
and the pipe is disconnected, there is no way left to
control the browser. Every pipe client tries to kill
the browser at that point. Instead, we can just shutdown
normally, leaving no core dumps.

Change-Id: Ib03a727930b00f48a6869c12c66c86072d45b5b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536354
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827457}