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This reverts commit 4d820bcd.

Reason for revert: causes flakiness in browser_tests (907981).

Original change's description:
> Reland "Unify input delay computations"
> 
> This is a reland of 5d945012
> 
> Original change's description:
> > Unify input delay computations
> >
> > This CL unifies the timestamp computations for FID as reported to UMA and FID as
> > exposed in the Web Perf API. It moves the UMA reporting from the
> > PageWidgetDelegate to the EventTiming class. After this CL, the same types of
> > events are logged by both the UMA metric and the webexposed metric. In addition,
> > this CL removes the check that there are default actions or event handlers from
> > EventTiming, which means that now the webexposed API will expose events even if
> > they have no associated event handlers. In particular, this means that a click
> > will now trigger mousedown, click, and mouseup entries, in that order. This is
> > reflected in changes to the layout tests.
> >
> > Bug: 897656
> > Change-Id: Ibeee0ffe9ff1fc0df74585da96a8fd3a6f2d17dc
> > Reviewed-on: https://chromium-review.googlesource.com/c/1334564
> > Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
> > Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
> > Reviewed-by: Timothy Dresser <tdresser@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#610201}
> 
> TBR=dtapuska@chromium.org
> 
> Bug: 897656, 843184
> Change-Id: I4d97f2731fe957696c0e908d5ef3493235b52d49
> Reviewed-on: https://chromium-review.googlesource.com/c/1348254
> Reviewed-by: Nicolás Peña Moreno <npm@chromium.org>
> Reviewed-by: Timothy Dresser <tdresser@chromium.org>
> Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#610499}

TBR=tdresser@chromium.org,dtapuska@chromium.org,npm@chromium.org

Change-Id: Ib5a3717393c14d5455bb97e92187d887465bef88
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 897656, 843184, 907981
Reviewed-on: https://chromium-review.googlesource.com/c/1349253Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610553}