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When browser shutdown started pipe file descriptors are closed
on the UI thread while there may be outstanding reads and writes
on parallel threads. If such read/write operations fail error
messages will only be written to the console if pipe shutdown
has not begun yet.

Bug: none
Change-Id: I57e9b6c7f2921335cc2bb1f5289bd9347bba1f68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2108825Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Yury Semikhatsky <yurys@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751605}