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Due to some bug within the translation pipeline, translated grd files
sometimes end up with multiple plural entries that have the same/similar
key, eg: '=1' and 'one'. This change makes sure that the xml output only
has one entry in per key. This is required by aapt2, which fails with an error
otherwise.

Bug: 787488
Change-Id: I6d98c1739a7dbd3872c31cbfca63b0bd5612c79d
Reviewed-on: https://chromium-review.googlesource.com/807148
Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521888}