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Effectively removing them from Android, where there is no PPAPI. Also
fix an "is_chromeos" typo.

Change-Id: I1395ccf368c1d0f593352d1ae2755fcb5920468a
Reviewed-on: https://chromium-review.googlesource.com/1140531Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575885}