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Android unit tests don't work on Android R+, but this isn't mentioned
in the docs, and the error message is pretty arcane and hard to
understand. This change updates the docs to mention this problem.

Bug: 1094062
Change-Id: I77b196febde1009eb13b195be937243e96ace1a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495968
Commit-Queue: David Van Cleve <davidvc@chromium.org>
Auto-Submit: David Van Cleve <davidvc@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820493}