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This cl adds a new os_settings_resources_v3.grdp file, in preparation of migrating
to Polymer 3.

Bug: 1045266
Change-Id: I55103ba896586f7322498449e2c5b2eed7f70a97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2167803
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763523}