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This CL moves chromeOS strings for settings Device power page strings
from settings_strings.grdp to os_settings_strings.grdp. It continues
the process of moving all chromeOS specific strings.

Bug: 967883
Change-Id: Ied133db18f986ab7a78d9d120d5e162403a8a0c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067460
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745245}