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This CL moves chromeOS strings for settings people 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: I1129aa982124596f102d1586f2a183ab894d9b92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2070411
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745615}