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This CL continues the process of moving OS specific strings from
settings_strings.grdp to os_settings_strings.grdp, specifically
account manager strings.

Bug: 967883
Change-Id: I9c6703515ff28fc71c3ad85239024f2e9b75ccd3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062901
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742843}