Remove UMA metrics for CSS lazy parsing.

Also transfer Style.* metric ownership to futhark.

Bug: 851782
Change-Id: I1d2227df37e6e5be83bae2e5359ce4e8a8b8dcd3
Reviewed-on: https://chromium-review.googlesource.com/1149865
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578038}
6 files changed