GitLab

Remove the per-detect() UMA counters and use instead constructors,
because in a normal usage pattern the detect() method can be called
many times on the same object, and we don't want to skew the UMA.

Bug: 659138
Change-Id: Ib4aef88c35dd4853ececbf71cc12a96eaca020f3
Reviewed-on: https://chromium-review.googlesource.com/511344
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#473798}