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Usage has been migrated to use the standard //base/metrics helpers.

Bug: 1047547
Change-Id: I8edfefb774a6154e19763833a7885e491d9a3996
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2559557Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830912}