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Summary:
Part of https://github.com/pytorch/audio/issues/2164.
Removes debug code and associated arguments/fields left in previous PRs.

Pull Request resolved: https://github.com/pytorch/audio/pull/2168

Reviewed By: hwangjeff

Differential Revision: D33712999

Pulled By: mthrok

fbshipit-source-id: 0729e9fbc146c48887379b6231e4d6e8cb520c44