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This CL moves Privacy Personalization strings from AddPrivacyStrings()
to the shared string provider, and moves strings from the function
that are OS exclusive from browser settings string provider to OS
settings strings provider.

Bug: 967888
Change-Id: I72c7b27a4e04a091ff347b420dde53ea7baf418d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2029329Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738045}