Revert of Remove deprecated CodecType methods. (patchset #1 id:1 of https://codereview.webrtc.org/3009583002/ )

Reason for revert:
It breaks chromium FYI bots.

E.g.: https://build.chromium.org/p/chromium.webrtc.fyi/builders/Win%20Builder/builds/11615

Original issue's description:
> Remove deprecated CodecType methods.
>
> These are no longer needed as all clients have been updated to use the
> new methods that always return a value.
>
> BUG=None
>
> Review-Url: https://codereview.webrtc.org/3009583002
> Cr-Commit-Position: refs/heads/master@{#19559}
> Committed: https://chromium.googlesource.com/external/webrtc/+/1a92d0de49779567241e97e50cb69d51257adcce

TBR=magjed@webrtc.org,tommi@webrtc.org,kthelgason@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/3010553002
Cr-Original-Commit-Position: refs/heads/master@{#19563}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 673caedc39f8fc0975fb902041c9000c271bfccf
2 files changed