Revert 258215 "Remove muting for extreme playbackRates."

It exposed a bug in the WSOLA algorithm that causes it to incorrectly
trigger underflows.

> Remove muting for extreme playbackRates.
> Audio was muted below 0.5x and above 4x as the quality degraded
> significantly under the crossfade algorithm. The quality is now much
> better under the WSLOA algorithm (r220343).
> BUG=289354
> Review URL:


Review URL:

git-svn-id: svn:// 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed