Rewrite is_linux flag for base and build components.

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: I93991bfe0647a6b280b9fb9531474ae70f6c4cfa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2325766
Commit-Queue: Sean McAllister <smcallis@google.com>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793509}
GitOrigin-RevId: deaa740d5532fa2f80bea90ba26a4cc235392627
1 file changed