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This metric is no longer needed.

Bug: 738126
Change-Id: If8baa53178238335d75ccefd8d6ae9065b2d00ad
Reviewed-on: https://chromium-review.googlesource.com/563757Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Patrick Monette <pmonette@chromium.org>
Commit-Queue: Xi Cheng <chengx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485355}