Revert "Reland "Upconvert various types to int.", common_audio portion."

This reverts commit 15b58eea282b03b6347c64714079691f55e6097f.

BUG=499241
TBR=andrew

Review URL: https://codereview.webrtc.org/1182683003

Cr-Commit-Position: refs/heads/master@{#9426}
4 files changed