Revert of Supporting 48kHz PCM file. (patchset #1 id:1 of https://codereview.webrtc.org/2790493004/ )

Reason for revert:
broke internal project

Original issue's description:
> Supporting 48kHz PCM file.
>
> BUG=None
>
> Review-Url: https://codereview.webrtc.org/2790493004
> Cr-Commit-Position: refs/heads/master@{#17493}
> Committed: https://chromium.googlesource.com/external/webrtc/+/5f93709e7c65faa9616f09368a92d47087b778f5

TBR=niklas.enbom@webrtc.org,solenberg@webrtc.org,minyue@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Review-Url: https://codereview.webrtc.org/2791453004
Cr-Original-Commit-Position: refs/heads/master@{#17496}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: bc436ede076cff1b1c12045c3bf0bb9b9a1c0e24
6 files changed