Revert "Speculative fixes for flakey ChromeVox tests using waitForCalm"

This reverts commit a164e645314a667c915ec6daefc7de162a6a6a08.

Reason for revert: <INSERT REASONING HERE>
Still flakes.
Original change's description:
> Speculative fixes for flakey ChromeVox tests using waitForCalm
> 
> Bug: 622387
> Change-Id: Idddd32bf271f28fb5d22cbef54b4250e636e2f6f
> Reviewed-on: https://chromium-review.googlesource.com/c/1372312
> Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
> Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#615963}

TBR=dmazzoni@chromium.org,dtseng@chromium.org

Change-Id: I676dbeca80230947b717b2713413dfb7800c4401
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 622387
Reviewed-on: https://chromium-review.googlesource.com/c/1376106
Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616359}
2 files changed