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Android uses a custom UI with the cross-platform strings for address
input. This is a re-land of http://crrev.com/890103002 with a minor
alteration to fix Android GN build: do not build the validator on
Android.

TBR=estade@chromium.org
BUG=454120

Review URL: https://codereview.chromium.org/867043003

Cr-Commit-Position: refs/heads/master@{#314414}