Stop using hardcoded payload types for video codecs

webrtc/media/engine/payload_type_mapper.cc

Index: webrtc/media/engine/payload_type_mapper.cc
diff --git a/webrtc/media/engine/payload_type_mapper.cc b/webrtc/media/engine/payload_type_mapper.cc
index 58eab16eada9de773d250d44ce5a51f54ea2c490..67a22b202540e10e14d7ed9d36dc27a0a4f243a6 100644
--- a/webrtc/media/engine/payload_type_mapper.cc
+++ b/webrtc/media/engine/payload_type_mapper.cc
@@ -53,38 +53,14 @@ PayloadTypeMapper::PayloadTypeMapper()
           {{"G729",   8000, 1}, 18},
 
           // Payload type assignments currently used by WebRTC.
-          // Includes video, to reduce collisions (and thus reassignments)
-          // RTX codecs mapping to specific video payload types
-          {{kRtxCodecName,    90000, 0,
-              {{kCodecParamAssociatedPayloadType,
-                      std::to_string(kDefaultVp8PlType)}}},
-                kDefaultRtxVp8PlType},
-          {{kRtxCodecName,    90000, 0,
-              {{kCodecParamAssociatedPayloadType,
-                      std::to_string(kDefaultVp9PlType)}}},
-                kDefaultRtxVp9PlType},
-          {{kRtxCodecName,    90000, 0,
-              {{kCodecParamAssociatedPayloadType,
-                      std::to_string(kDefaultRedPlType)}}},
-                kDefaultRtxRedPlType},
-          {{kRtxCodecName,    90000, 0,
-              {{kCodecParamAssociatedPayloadType,
-                      std::to_string(kDefaultH264PlType)}}},
-                kDefaultRtxH264PlType},
           // Other codecs
-          {{kVp8CodecName,    90000, 0}, kDefaultVp8PlType},
-          {{kVp9CodecName,    90000, 0}, kDefaultVp9PlType},
           {{kIlbcCodecName,    8000, 1}, 102},
           {{kIsacCodecName,   16000, 1}, 103},
           {{kIsacCodecName,   32000, 1}, 104},
           {{kCnCodecName,     16000, 1}, 105},
           {{kCnCodecName,     32000, 1}, 106},
-          {{kH264CodecName,   90000, 0}, kDefaultH264PlType},
           {{kOpusCodecName,   48000, 2,
               {{"minptime", "10"}, {"useinbandfec", "1"}}}, 111},
-          {{kRedCodecName,    90000, 0}, kDefaultRedPlType},
-          {{kUlpfecCodecName, 90000, 0}, kDefaultUlpfecType},
-          {{kFlexfecCodecName, 90000, 0}, kDefaultFlexfecPlType},
           {{kDtmfCodecName,    8000, 1}, 126}}) {
   // TODO(ossu): Try to keep this as change-proof as possible until we're able
   // to remove the payload type constants from everywhere in the code.