Cleanup: remove BlockedWriterInterface from QuicPacketWriter.

net/tools/quic/quic_default_packet_writer.cc

Index: net/tools/quic/quic_default_packet_writer.cc
diff --git a/net/tools/quic/quic_default_packet_writer.cc b/net/tools/quic/quic_default_packet_writer.cc
index 6d77c00a9f565a7f37209ef7f1590e1edc53bdab..ff83be6d0c5c5b26ec070eada6c5f47f5c27d5d0 100644
--- a/net/tools/quic/quic_default_packet_writer.cc
+++ b/net/tools/quic/quic_default_packet_writer.cc
@@ -18,8 +18,7 @@ QuicDefaultPacketWriter::~QuicDefaultPacketWriter() {}
 WriteResult QuicDefaultPacketWriter::WritePacket(
     const char* buffer, size_t buf_len,
     const net::IPAddressNumber& self_address,
-    const net::IPEndPoint& peer_address,
-    QuicBlockedWriterInterface* blocked_writer) {
+    const net::IPEndPoint& peer_address) {
   DCHECK(!IsWriteBlocked());
   WriteResult result = QuicSocketUtils::WritePacket(
       fd_, buffer, buf_len, self_address, peer_address);