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

Bug: 967883
Change-Id: Ie0f1edeea54b8399f205ca2facc0b8b2c2f5d55e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2069968
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746642}