Revert of Implement a site engagement score based on time-on-site. (patchset #20 id:400001 of https://codereview.chromium.org/1338603002/ )
Reason for revert:
Appears to break SiteEngagementServiceBrowserTest.SimulateInput on at least Mac 10.10: see https://build.chromium.org/p/chromium.mac/builders/Mac10.10%20Tests/builds/3034.
Original issue's description:
> Implement a site engagement score based on time-on-site.
>
> Time spent on site is an important indicator of how important an origin
> is to a user. This CL detects time on site by registering callbacks to
> handle user input, using any mouse or keypress events as a proxy for
> a user spending time on the site. Input events are checked for at
> regular intervals, with site engagement updated if input has been
> present in each interval.
>
> BUG=464234
>
> Committed: https://crrev.com/f3226a4f280b20eb00024d724b9e70ec1edc2e33
> Cr-Commit-Position: refs/heads/master@{#351465}
TBR=calamity@chromium.org,benwells@chromium.org,jdduke@chromium.org,dominickn@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=464234
Review URL: https://codereview.chromium.org/1376143003
Cr-Commit-Position: refs/heads/master@{#351511}
8 files changed
