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This CL moves chromeOS strings for apps section page  from
settings_strings.grdp to chromeos_strings.grdp and
os_settings_strings.grdp. It continues the process of moving all
chromeOS specific strings.

Bug: 967883
Change-Id: I8411437ef5af1c445941ac3a494a92a52fa4b548
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2142776
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757735}