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This CL moves chromeOS strings for settings Device keyboard 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: Ib53c91f9cce5da404f54cd2c0fd05dbd3cab393a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067278
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746891}