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Currently is_linux is set to true on Chrome OS build,
but it is planned to set false. This is the preparation
to keep the compatibility.

Bug: 1110266
Test: Built locally.
Change-Id: I398d3fb69f918d079a863c23971518ae0341f63e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2405753Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Ted Meyer <tmathmeyer@chromium.org>
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806459}