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|is_posix| will be switched to false for Fuchsia, this is a preliminary change.

Bug: 812974
Change-Id: Ic0292e13421cecacd54f49a981778cda746c08f0
Reviewed-on: https://chromium-review.googlesource.com/988839Reviewed-by: Adam Langley <agl@chromium.org>
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548179}