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This was originally added for linux-chromeos builds. Now that we have
is_chromeos_device here, it's redundant, and it unintentionally disables
ThinLTO/CFI for ARC pieces of non-linux CrOS builds.

Bug: 1062713, 1050199
Change-Id: I27022ed72597a90ae7d2bb385729550fa8d772e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2108822Reviewed-by: Bob Haarman <inglorion@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: George Burgess <gbiv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751505}