Revert of Fix a bug where if a crypto packet is spuriously retransmitted

net/quic/quic_sent_packet_manager.cc

Index: net/quic/quic_sent_packet_manager.cc
diff --git a/net/quic/quic_sent_packet_manager.cc b/net/quic/quic_sent_packet_manager.cc
index 0bc3af5ca1d8523e9fec8ff9928e135c3b36b2f6..18d8997ebcfee03492694d2912dbaff146b96a07 100644
--- a/net/quic/quic_sent_packet_manager.cc
+++ b/net/quic/quic_sent_packet_manager.cc
@@ -251,19 +251,21 @@ void QuicSentPacketManager::RetransmitUnackedPackets(
   }
 }
 
-void QuicSentPacketManager::DiscardUnencryptedPackets() {
+void QuicSentPacketManager::NeuterUnencryptedPackets() {
   QuicUnackedPacketMap::const_iterator unacked_it = unacked_packets_.begin();
   while (unacked_it != unacked_packets_.end()) {
     const RetransmittableFrames* frames =
         unacked_it->second.retransmittable_frames;
     if (frames != NULL && frames->encryption_level() == ENCRYPTION_NONE) {
-      // Once you're forward secure, no unencrypted packets will be sent.
-      // Additionally, it's likely the peer will be forward secure, and no acks
-      // for these packets will be received, so mark the packet as handled.
+      // Since once you're forward secure, no unencrypted packets will be sent,
+      // crypto or otherwise. Unencrypted packets are neutered and abandoned, to
+      // ensure they are not retransmitted or considered lost from a congestion
+      // control perspective.
       pending_retransmissions_.erase(unacked_it->first);
-      unacked_it = MarkPacketHandled(unacked_it->first,
-                                     QuicTime::Delta::Zero());
-      continue;
+      // TODO(ianswett): This may cause packets to linger forever in the
+      // UnackedPacketMap.
+      unacked_packets_.NeuterPacket(unacked_it->first);
+      unacked_packets_.SetNotPending(unacked_it->first);
     }
     ++unacked_it;
   }