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This reverts commit 4f9a19f1.

Reason for revert: Suspected in causing webkit_layout_test failures
https://ci.chromium.org/p/chromium/builders/ci/Mac10.13%20Tests%20%28dbg%29/9784
* media/video-played-collapse.html
* virtual/video-surface-layer/media/video-played-collapse.html

Original change's description:
> AudioService: Fixes for loopback underruns/timing issues.
> 
> Fixes a "choppy audio" issue on platforms with certain audio timing
> parameters/scenarios. Investigation on crbug.com/934770 led to the
> realization that three related problems needed to be addressed:
> 
> 1. Fix the "gap" detection in audio::SnooperNode to check in BOTH
> directions, not just one direction; and on both the input and output
> flows. This accounts for the case where a device-switch in
> audio::OutputController results in a sudden drastic shift in the delay
> timestamps.
> 
> 2. Add automatically-increasing capture delay logic to
> audio::LoopbackStream to ensure the reads from all nodes' delay buffer
> will never result in underrun.
> 
> 3. Increased the accuracy of media::FakeAudioWorker/OutputStream by: a)
> addressing a subtle source of error in task scheduling delay math due to
> integer truncation; b) exposing timestamps to worker callbacks that
> allow FakeAudioOutputStream to provide a |delay| and |delay_timestamp|
> that behaves just like a real AudioOutputStream. This "lessens the blow"
> of a device-switch to SnooperNode.
> 
> Bug: 934770
> Change-Id: Ia75f18b2be3ad905f27d6ad882df9632764bb81c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1504981
> Commit-Queue: Yuri Wiitala <miu@chromium.org>
> Reviewed-by: Max Morin <maxmorin@chromium.org>
> Reviewed-by: Oskar Sundbom <ossu@chromium.org>
> Reviewed-by: Weiyong Yao <braveyao@chromium.org>
> Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#638427}

TBR=dalecurtis@chromium.org,miu@chromium.org,braveyao@chromium.org,maxmorin@chromium.org,ossu@chromium.org

Change-Id: I845f547c60481ebde0ae24d1a83d59f2f750f7e3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 934770
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1509365Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638708}