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Actually, this is more of a workaround. The real fix would be:

1. work out why @SuppressWarnings("unchecked") isn't working.
2. move the XML crap (which we're not maintaining, and where we don't fix
   warnings) out into external/.
3. uncomment the commented-out line in this patch.

(I've fixed our real non-"unchecked" warnings in earlier patches.)

Change-Id: I5a2dcb071eef5b46c8f166f9492d56cfdb5c6fa5