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

net/quic/core/quic_connection.cc

Index: net/quic/core/quic_connection.cc
diff --git a/net/quic/core/quic_connection.cc b/net/quic/core/quic_connection.cc
index 56e8c33e2625320e96c2d93321d5a6e00cc8e146..7bb88eee08e0f31904453e1e4df855d6528a7b99 100644
--- a/net/quic/core/quic_connection.cc
+++ b/net/quic/core/quic_connection.cc
@@ -908,7 +908,6 @@ bool QuicConnection::OnPathCloseFrame(const QuicPathCloseFrame& frame) {
   }
   QUIC_DLOG(INFO) << ENDPOINT
                   << "PATH_CLOSE_FRAME received for path: " << frame.path_id;
-  OnPathClosed(frame.path_id);
   return connected_;
 }
 
@@ -1144,7 +1143,6 @@ void QuicConnection::SendPathClose(QuicPathId path_id) {
   // Opportunistically bundle an ack with this outgoing packet.
   ScopedPacketBundler ack_bundler(this, SEND_ACK_IF_PENDING);
   packet_generator_.AddControlFrame(QuicFrame(new QuicPathCloseFrame(path_id)));
-  OnPathClosed(path_id);
 }
 
 const QuicConnectionStats& QuicConnection::GetStats() {
@@ -2337,11 +2335,6 @@ void QuicConnection::StartPeerMigration(
   sent_packet_manager_.OnConnectionMigration(peer_migration_type);
 }
 
-void QuicConnection::OnPathClosed(QuicPathId path_id) {
-  // Stop receiving packets on this path.
-  framer_.OnPathClosed(path_id);
-}
-
 bool QuicConnection::ack_frame_updated() const {
   return received_packet_manager_.ack_frame_updated();
 }