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For some applications where we need to keep multiple copies of the audio bus around (particularly in STL containers), a scoped_ptr to an audio bus isn't enough. For those rare situations, we're adding a RefCounted version of the AudioBus.

R=dalecurtis@chromium.org
BUG=None.

Review URL: https://codereview.chromium.org/388563005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282510 0039d316-1c4b-4281-b951-d872f2087c98