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This reverts commit fc04607a.

Reason for revert: Likely caused several regressions

Original change's description:
> cc: Subtract estimated display draw time from begin frame deadline
> 
> Display draw time was being subtraced from display scheduler's deadline,
> but a similar adjustment was missing from cc scheduler's deadline. To
> fix this inconsistency, this CL applies the deadline adjustment at a
> single place, the begin frame source so that there's no mismatch.
> 
> This makes cc scheduler have a later deadline and can cause it to wait
> longer for the main thread. Recent experimentation has shown improved
> latency in the absence of a scheduler deadline. It's hoped that some of
> the improvement can be achieved by just fixing the deadline.
> 
> Bug: 1042584
> Change-Id: Ia948b64c1dbba5239d1b97062224e73487e35fba
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2045210
> Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
> Auto-Submit: Sunny Sachanandani <sunnyps@chromium.org>
> Reviewed-by: Khushal <khushalsagar@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#781159}

TBR=sadrul@chromium.org,sunnyps@chromium.org,khushalsagar@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1042584, 1098444, 1098229
Change-Id: I3dcad61af5f1ef6d8a38a3290c6c2e04c503dbb3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2264629Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782068}