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Also removes some obsolete Cocoa l10n helper functions.

Bug: 912132
Change-Id: I0157f1ea6e615a16e973c2ad283fa35d1cb644bf
Reviewed-on: https://chromium-review.googlesource.com/c/1367906Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614827}