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There are three places that use |IDS_CONTROLLED_SETTING_POLICY|, but
AFAIK there's no need to change the other two places
(arc_support_host.cc and extensions_ui.cc).

Bug: 873946
Change-Id: I34e9fb0a20139b0aaca6380e949248745f50ed58
Reviewed-on: https://chromium-review.googlesource.com/1180526Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584361}