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The change replaces deprecated variable names is_lacros and
IS_LACROS with is_chromeos_lacros and IS_CHROMEOS_LACROS.

Bug: 1052397
Change-Id: I9d4664ed4f9ef0b95a43e51183f92a29fd0a5040
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2623611Reviewed-by: David Benjamin <davidben@chromium.org>
Commit-Queue: Yuta Hijikata <ythjkt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842895}