This reverts commit 7db900e2e7.
Reason for revert: Speculative revert
Original change's description:
> Simplify pacer queue
>
> This CL simplifies the pacer queue by removing the now unnecessary
> beginpop/cancelpop/finalizepop methods. Instead there's a const top()
> and a pop() much like an stl queue.
> Old methods using the deprecated pacing code path are cleaned away.
>
> Bug: webrtc:10633
> Change-Id: Ib6da4d46a571bf56415172b790cc9e3f63206a38
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/150522
> Commit-Queue: Erik Språng <sprang@webrtc.org>
> Reviewed-by: Philip Eliasson <philipel@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#28997}
TBR=sprang@webrtc.org,philipel@webrtc.org
# Not skipping CQ checks because original CL landed > 1 day ago.
Bug: webrtc:10633
Change-Id: I38f61afed4f4d542e236bcce3152a3aab52c6e6b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/151120
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29030}
f660e81a56