Remove QuicFecGroup::MinProtectedPacket which is no longer needed. No behavior change expected.

net/quic/quic_fec_group.cc

Index: net/quic/quic_fec_group.cc
diff --git a/net/quic/quic_fec_group.cc b/net/quic/quic_fec_group.cc
index c9aaa812c1414ababe56416733f92b6c07433319..35251d958a422b1ccfc7aceed73fb7d2d7a4c390 100644
--- a/net/quic/quic_fec_group.cc
+++ b/net/quic/quic_fec_group.cc
@@ -182,10 +182,6 @@ const StringPiece QuicFecGroup::PayloadParity() const {
   return StringPiece(payload_parity_, payload_parity_len_);
 }
 
-QuicPacketNumber QuicFecGroup::MinProtectedPacket() const {
-  return min_protected_packet_;
-}
-
 QuicPacketCount QuicFecGroup::NumReceivedPackets() const {
   return received_packets_.size();
 }