Revert 248688 "[AudioPlayer] Enable new audio-player by default"

> [AudioPlayer] Enable new audio-player by default
> 
> BUG=273308
> TEST=manually tested
> R=hirono@chromium.org
> 
> Review URL: https://codereview.chromium.org/152813004

TBR=yoshiki@chromium.org

Review URL: https://codereview.chromium.org/133353007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248696 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248696