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This is a mechanical change that renames deprecated macro replacing:

- BUILDFLAG(IS_{ASH,LACROS}) with BUILDFLAG(IS_CHROMEOS_{ASH,LACROS}),
- gn var is_{ash,lacros} with is_chromeos_{ash,lacros}.

There is a section about the renaming on http://go/lacros-macros.

Bug: 1052397
Change-Id: I281524bf9fecaa6ed36cf1de87221a79506ec0b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2594623Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: K. Moon <kmoon@chromium.org>
Commit-Queue: Yuta Hijikata <ythjkt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837831}