GitLab

This migrates is_linux (which is also set for chromeos) to explicitly
include chromeos as is_linux || is_chromeos in preparation for
separating those flags.

Bug: 1110266
Change-Id: I4dc4cd45eeaf1ca0a824b2a236fc55e0871f1c75
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2326295Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Sean McAllister <smcallis@google.com>
Cr-Commit-Position: refs/heads/master@{#793515}