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Lacros team has decided to rename gn variable is_ash|lacros and macro
IS_ASH|LACROS as is_chromeos_ash|lacros and IS_CHROMEOS_ASH|LACROS
respectively. This is to make it clearer that these variables are Chrome
OS related variables.

Bug: 1052397
Change-Id: I7e74ef50af0695809340f9d3645de6487494334e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2502061
Commit-Queue: Yuta Hijikata <ythjkt@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821730}