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This is now defined the same as `is_linux` and is no longer needed.

Bug: 1132395
Change-Id: Ibbdc6666c52c38e4765d4792a7a10e0c1e8c6747
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443496Reviewed-by: Dirk Pranke <dpranke@google.com>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816246}