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This CL replaces the slower i18n() code with $i18nPolymer replacements
and reduces usage if I18nBehavior.

Bug: 677338
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I324e5d148e71cd4abc0cfa028d5b48fbc1cefaf2
Reviewed-on: https://chromium-review.googlesource.com/812571Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523215}