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CompositorLatency.Diagnostic.PresentationTimeDeltaFromDeadline we being
recorded to validate the assumption that most presented frames would be
reported close to the deadline. As reported values confirm this
assumption we do not need to track this values anymore, so this change
removes this metric.

Bug: 1125656
Change-Id: Ic2ab96609577c91d71d402a114d22f3df14cf86e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527622Reviewed-by: Jonathan Ross <jonross@chromium.org>
Reviewed-by: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Behdad Bakhshinategh <behdadb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826294}