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The change replaces deprecated variable names is_ash, is_lacros,
IS_ASH, IS_LACROS with is_chromeos_ash, is_chromeos_lacros,
IS_CHROMEOS_ASH and IS_CHROMEOS_LACROS.

Bug: 1052397
Change-Id: Id8e24910248b5537ba7e558b02be10c2ee7c2a84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2621793Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Yuta Hijikata <ythjkt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842894}