Cleanup: remove BlockedWriterInterface from QuicPacketWriter.

net/quic/quic_connection.cc

Index: net/quic/quic_connection.cc
diff --git a/net/quic/quic_connection.cc b/net/quic/quic_connection.cc
index f9c0cc2413033cdccc229b9381851c6535d3156c..737fee4d2c94610cee37c76a2bf41043de1ac34e 100644
--- a/net/quic/quic_connection.cc
+++ b/net/quic/quic_connection.cc
@@ -778,7 +778,7 @@ void QuicConnection::SendVersionNegotiationPacket() {
           framer_.supported_versions()));
   WriteResult result = writer_->WritePacket(
       version_packet->data(), version_packet->length(),
-      self_address().address(), peer_address(), this);
+      self_address().address(), peer_address());
 
   if (result.status == WRITE_STATUS_ERROR) {
     // We can't send an error as the socket is presumably borked.
@@ -1156,7 +1156,7 @@ bool QuicConnection::WritePacket(EncryptionLevel level,
 
   WriteResult result =
       writer_->WritePacket(encrypted->data(), encrypted->length(),
-                           self_address().address(), peer_address(), this);
+                           self_address().address(), peer_address());
   if (result.error_code == ERR_IO_PENDING) {
     DCHECK_EQ(WRITE_STATUS_BLOCKED, result.status);
   }