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This patch marks it removed at M73.
Intent to Deprecate and Remove:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/h-JwMiPUnuU/sl79aLoLBQAJ

Bug: 671907
Change-Id: I30df492e54c60d54aa45924fc71f109fe1be2420
Reviewed-on: https://chromium-review.googlesource.com/1192567
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Hayato Ito <hayato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587480}