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Currently we check if the keyboard has the 'Assistant' key to enable
Assistant. It seems some external wireless keyboards report they do
have the 'Assistant' key.

Since the reason we were checking the keyboard is for nocturne, we
decide to only special case board 'eve', 'nocturne' and 'atlas' instead
of doing the keyboard layout check.

For more background, see discussion in crbug/1025961

Bug: 1025961
Test: Manual Test
Change-Id: Iacb42a6b8bfc01b662002f0d93258642b6976ca0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1978838
Commit-Queue: Yue Li <updowndota@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727002}