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The change is mostly mechanical replacing defined(OS_CHROMEOS) with
BUILDFLAG(IS_CHROMEOS_ASH) and GN variable is_chromeos with is_ash
with some special cases (For those cases please refer to
http://go/lacros-macros).

The patch is made in preparation to switching lacros build from
target_os=linux to target_os=chromeos. This will prevent lacros from
changing behaviour after the switch.

Bug: 1052397
Change-Id: Ibe63a58f20c536f639c7d5af640df4f37ce460c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2494280
Commit-Queue: Yuta Hijikata <ythjkt@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828629}