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This change restricts the usage of WriteWithoutResponse to macOS. On
macOS this is required for performance reasons, but on other platforms
this can lead to misbehavior. This results in requests not being
handled correctly.

Bug: 763303
Change-Id: I5b609fd70eafdf4b9abad680218a9e04ac302703
Reviewed-on: https://chromium-review.googlesource.com/1167515
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582555}