Remove muted_ and playback_rate_ from media::AudioRendererAlgorithm.

We don't need to hold onto the state as playback rate is only used when
calling FillBuffer().

BUG=370634

Review URL: https://codereview.chromium.org/411683002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284802 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed