Cancel pending retransmissions which are greater than the largest newly acked packet when using the…

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 61b6985d9f873e5d7d80ba1e18a00bef12ca9faa..5acefc06fd610b151d479d1002234e4085301ff1 100644
--- a/net/quic/crypto/crypto_protocol.h
+++ b/net/quic/crypto/crypto_protocol.h
@@ -81,6 +81,8 @@ const QuicTag k1CON = TAG('1', 'C', 'O', 'N');   // Emulate a single connection
 const QuicTag kNTLP = TAG('N', 'T', 'L', 'P');   // No tail loss probe
 const QuicTag kNCON = TAG('N', 'C', 'O', 'N');   // N Connection Congestion Ctrl
 const QuicTag kNRTO = TAG('N', 'R', 'T', 'O');   // CWND reduction on loss
+const QuicTag kUNDO = TAG('U', 'N', 'D', 'O');   // Undo any pending retransmits
+                                                 // if they're likely spurious.
 const QuicTag kTIME = TAG('T', 'I', 'M', 'E');   // Time based loss detection
 const QuicTag kATIM = TAG('A', 'T', 'I', 'M');   // Adaptive time loss detection
 const QuicTag kMIN1 = TAG('M', 'I', 'N', '1');   // Min CWND of 1 packet