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- Remove messages that no longer apply now that CTAP2 is implemented on desktop
- Add Android-only error messages. I prepended these with 'ANDROID' for
clarity.

Bug: 678885
Change-Id: I96e5850752829c0b1e454837a9e1d1fdfa3a9630
Reviewed-on: https://chromium-review.googlesource.com/1139578
Commit-Queue: Kim Paulhamus <kpaulhamus@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576332}