Reland of Stop using hardcoded payload types for video codecs

webrtc/media/base/mediaconstants.cc

Index: webrtc/media/base/mediaconstants.cc
diff --git a/webrtc/media/base/mediaconstants.cc b/webrtc/media/base/mediaconstants.cc
index 5acd8cdb019b05d315618ede8908d67f7cf6ad82..bce252195a24e69bbab1d3d56b0ff5dfe2cd665e 100644
--- a/webrtc/media/base/mediaconstants.cc
+++ b/webrtc/media/base/mediaconstants.cc
@@ -108,17 +108,5 @@ const char kH264FmtpLevelAsymmetryAllowed[] = "level-asymmetry-allowed";
 const char kH264FmtpPacketizationMode[] = "packetization-mode";
 const char kH264ProfileLevelConstrainedBaseline[] = "42e01f";
 
-const int kDefaultVp8PlType = 100;
-const int kDefaultVp9PlType = 101;
-const int kDefaultH264PlType = 107;
-const int kDefaultRedPlType = 116;
-const int kDefaultUlpfecType = 117;
-const int kDefaultFlexfecPlType = 118;
-const int kDefaultRtxVp8PlType = 96;
-const int kDefaultRtxVp9PlType = 97;
-const int kDefaultRtxRedPlType = 98;
-const int kDefaultRtxH264ConstrainedBaselinePlType = 99;
-const int kDefaultRtxH264ConstrainedHighPlType = 102;
-
 const int kDefaultVideoMaxFramerate = 60;
 }  // namespace cricket