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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: I019e775b7ecd01c6a1c401c13d9a29abd35ad170
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2326290Reviewed-by: Jonathan Backer <backer@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Ted Meyer <tmathmeyer@chromium.org>
Reviewed-by: Matt Reynolds <mattreynolds@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Commit-Queue: Sean McAllister <smcallis@google.com>
Cr-Commit-Position: refs/heads/master@{#794605}