Revert "Version 2 "Refactoring DataContentDescription class""

This reverts commit 14b2758726879d21671a21291dfed8fb4fd5c21c.

Reason for revert: Internal import failed.

Original change's description:
> Version 2 "Refactoring DataContentDescription class"
> 
> (substantial changes since version 1)
> 
> This CL splits the cricket::DataContentDescription class into
> two classes: cricket::RtpDataContentDescription (used for RTP data)
> and cricket::SctpDataContentDescription (used for SCTP only).
> 
> SctpDataContentDescription no longer inherits from
> MediaContentDescriptionImpl, and no longer contains "codecs".
> 
> Due to usage of internal interfaces by consumers, shimming the old
> DataContentDescription API is needed.
> 
> A new cricket::DataContentDescription class is defined, which is
> a shim over RtpDataContentDescription and SctpDataContentDescription.
> It exposes as little functionality as possible, but supports the
> concerned consumer's usage
> 
> Design document:
> https://docs.google.com/document/d/1H5LfQxJA2ikMWTQ8FZ3_GAmaXM7knfVQWiSz6ph8VQ0/edit#
> 
> Version 1 reviewed-on: https://webrtc-review.googlesource.com/c/src/+/132700
> 
> Bug: webrtc:10358
> Change-Id: Icf95fb7308244d6f2ebfdb403aaffc544e358580
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/133900
> Commit-Queue: Harald Alvestrand <hta@webrtc.org>
> Reviewed-by: Steve Anton <steveanton@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#27853}

TBR=danilchap@webrtc.org,steveanton@webrtc.org,kwiberg@webrtc.org,hbos@webrtc.org,hta@webrtc.org,shampson@webrtc.org

Change-Id: Ibc16ba14c1cbf50345a9b79151b79df140482539
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:10358
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/135280
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27855}

1 files changed, 0 insertions, 35 deletions

diff --git a/pc/media_protocol_names.h b/pc/media_protocol_names.h
deleted file mode 100644
index 88f1c4659d..0000000000
--- a/pc/media_protocol_names.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/*
- *  Copyright 2019 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef PC_MEDIA_PROTOCOL_NAMES_H_
-#define PC_MEDIA_PROTOCOL_NAMES_H_
-
-#include <string>
-
-namespace cricket {
-
-// Names or name prefixes of protocols as defined by SDP specifications.
-extern const char kMediaProtocolRtpPrefix[];
-extern const char kMediaProtocolSctp[];
-extern const char kMediaProtocolDtlsSctp[];
-extern const char kMediaProtocolUdpDtlsSctp[];
-extern const char kMediaProtocolTcpDtlsSctp[];
-
-bool IsDtlsSctp(const std::string& protocol);
-bool IsPlainSctp(const std::string& protocol);
-
-// Returns true if the given media section protocol indicates use of RTP.
-bool IsRtpProtocol(const std::string& protocol);
-// Returns true if the given media section protocol indicates use of SCTP.
-bool IsSctpProtocol(const std::string& protocol);
-
-}  // namespace cricket
-
-#endif  // PC_MEDIA_PROTOCOL_NAMES_H_