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From the perspective of extensions, Lacros should be functionally
equivalent to ChromeOS rather than Linux.

Bug: 1164523
Change-Id: I020997a4185afb54018f19653f00f7b9d00f4f8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2623121Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842605}