Remove unused features from CompositingTimingHistory

DurationEstimatesInCompositorTimingHistory was added as an alternative
timing calculation for cc::Scheduler.

Initial attempts at analysis were inconclusive. This is likely because
this would only affect the Normal deadline, which is only ~5% of frames.

This change removes that path, along with some other unused
calculations.

Bug: 338977417
Change-Id: I37f494a962e84b01e4be98b7a1c2caea7efee175
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5648500
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1324892}