Remove FEC related connection options and update FEC related comment in code base.

net/quic/crypto/crypto_protocol.h

Index: net/quic/crypto/crypto_protocol.h
diff --git a/net/quic/crypto/crypto_protocol.h b/net/quic/crypto/crypto_protocol.h
index 25250bef7cbf1471e2517c9f576a3513cf27a233..14d3fab439ee53f7974b4fdfd68d9007a2b4547d 100644
--- a/net/quic/crypto/crypto_protocol.h
+++ b/net/quic/crypto/crypto_protocol.h
@@ -101,15 +101,6 @@ const QuicTag kTCID = TAG('T', 'C', 'I', 'D');   // Connection ID truncation.
 // Multipath option.
 const QuicTag kMPTH = TAG('M', 'P', 'T', 'H');   // Enable multipath.
 
-// FEC options
-const QuicTag kFHDR = TAG('F', 'H', 'D', 'R');   // FEC protect headers
-const QuicTag kFSTR = TAG('F', 'S', 'T', 'R');   // FEC protect all streams
-// Set FecSendPolicy for sending FEC packet only when FEC alarm goes off.
-const QuicTag kFSPA = TAG('F', 'S', 'P', 'A');
-// Run an experiment that sets FecTimeOut alarm to 0.25RTT.
-// TODO(rtenneti): Delete it after the experiment.
-const QuicTag kFRTT = TAG('F', 'R', 'T', 'T');
-
 // Enable bandwidth resumption experiment.
 const QuicTag kBWRE = TAG('B', 'W', 'R', 'E');  // Bandwidth resumption.
 const QuicTag kBWMX = TAG('B', 'W', 'M', 'X');  // Max bandwidth resumption.