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Define has_platform_accessibility_support by explicitly listening all supported platform. See https://chromium-review.googlesource.com/c/chromium/src/+/2547211 for discussion.

Bug: none
Change-Id: Ie3f34080d787a441b94e824b580672e327e1b417
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2581225
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835390}