GitLab

Some Posix-only instances were missed when disabling the OS_POSIX
macro for the Fuchsia build.

Bug: 836416
Change-Id: I291465a50813e984bdca223b1e533c2ad624062c
Reviewed-on: https://chromium-review.googlesource.com/1070625Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561569}