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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: I10ddaf5a25fcfbcd37fe762ea4035f5495aed247
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2594831
Commit-Queue: Yuta Hijikata <ythjkt@chromium.org>
Auto-Submit: Yuta Hijikata <ythjkt@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837913}