Make QuicFramer unaware of path. Also, send/receive PathClose has no effect.

net/quic/core/quic_connection.h

Index: net/quic/core/quic_connection.h
diff --git a/net/quic/core/quic_connection.h b/net/quic/core/quic_connection.h
index 6604c779237417930c01b59302131a785f462f1f..0c458186e7e86f4ab1caec5f44efc8830f2ff24f 100644
--- a/net/quic/core/quic_connection.h
+++ b/net/quic/core/quic_connection.h
@@ -834,15 +834,6 @@ class QUIC_EXPORT_PRIVATE QuicConnection
   QuicByteCount GetLimitedMaxPacketSize(
       QuicByteCount suggested_max_packet_size);
 
-  // Called when |path_id| is considered as closed because either a PATH_CLOSE
-  // frame is sent or received. Stops receiving packets on closed path. Drops
-  // receive side of a closed path, and packets with retransmittable frames on a
-  // closed path are marked as retransmissions which will be transmitted on
-  // other paths.
-  // TODO(fayang): complete OnPathClosed once QuicMultipathSentPacketManager and
-  // QuicMultipathReceivedPacketManager are landed in QuicConnection.
-  void OnPathClosed(QuicPathId path_id);
-
   // Do any work which logically would be done in OnPacket but can not be
   // safely done until the packet is validated. Returns true if packet can be
   // handled, false otherwise.