Delete I420 encoder and decoder.

webrtc/common_types.h

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 613 matching lines @@
   size_t         spsLen;
   const uint8_t* ppsData;
   size_t         ppsLen;
 };
 
 // Video codec types
 enum VideoCodecType {
   kVideoCodecVP8,
   kVideoCodecVP9,
   kVideoCodecH264,
+  // TODO(nisse): kVideoCodecI420 is unused in webrtc, but used in
+  // Chrome tests. Delete after Chrome is updated.
   kVideoCodecI420,
   kVideoCodecRED,
   kVideoCodecULPFEC,
   kVideoCodecGeneric,
   kVideoCodecUnknown
 };
 
 union VideoCodecUnion {
   VideoCodecVP8       VP8;
   VideoCodecVP9       VP9;
@@ skipping 232 matching lines @@
                                    uint32_t ssrc) = 0;
 };
 
 // RTCP mode to use. Compound mode is described by RFC 4585 and reduced-size
 // RTCP mode is described by RFC 5506.
 enum class RtcpMode { kOff, kCompound, kReducedSize };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_TYPES_H_