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Replacing placeholder strings, and move all the add-string calls to under
one function.

also fixes a path bug for apps/ -> google_apps/ introduced in
https://chromium-review.googlesource.com/c/chromium/src/+/1285210

Bug: 874122
Change-Id: Ibd7940c6de71e3a3befc1c5342f6f6097e37de6e
Reviewed-on: https://chromium-review.googlesource.com/c/1285325
Commit-Queue: Scott Chen <scottchen@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601791}