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After chrome.metricsPrivate fakes landed, CL:2500642 does not need use
these window.metrics fakes. Remove them.

Bug: 1113981
Change-Id: Iefcd5881a31a147e9387a9a175723a571412e5d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2531597
Auto-Submit: Noel Gordon <noel@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826174}