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This CL updates the options/chromeos html from the old i18n-content and
values to $i18n{} replacements.

TBR=stevenjb@chromium.org

Bug: 677338
Change-Id: I24685ac591b8116baa52fe059f5076d7c1674232
Reviewed-on: https://chromium-review.googlesource.com/563608
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485111}