Copy content::ManifestUmaUtil to blink

This is a part of moving manifest implementation to blink.
content::ManifestUmaUtil would be removed after completing to move
the manifest implementation from content to blink.

Bug: 704441
Change-Id: I5ae55cc02c01c3b3f30268bb0da8dadc83b84f0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1524818
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#642371}
3 files changed