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These strings were initially thought to be used by a separate page, but
we ended up never moving them to the file where other strings for the
Settings page are.

Bug: 776538
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I01c8799d62564c56a8b0e4b59aaf948107afa7aa
Reviewed-on: https://chromium-review.googlesource.com/762157
Commit-Queue: Fabio Tirelo <ftirelo@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515810}