Remove unused method OnPacketSent from QuicPacketDroppingTestWriter::Delegate.

net/tools/quic/test_tools/packet_dropping_test_writer.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_TOOLS_QUIC_TEST_TOOLS_PACKET_DROPPING_TEST_WRITER_H_
 #define NET_TOOLS_QUIC_TEST_TOOLS_PACKET_DROPPING_TEST_WRITER_H_
 
 #include <list>
 #include <string>
 
@@ skipping 12 matching lines @@
 namespace test {
 
 // Simulates a connection that drops packets a configured percentage of the time
 // and has a blocked socket a configured percentage of the time.  Also provides
 // the options to delay packets and reorder packets if delay is enabled.
 class PacketDroppingTestWriter : public QuicPacketWriterWrapper {
  public:
   class Delegate {
    public:
     virtual ~Delegate() {}
-    virtual void OnPacketSent(WriteResult result) = 0;
     virtual void OnCanWrite() = 0;
   };
 
   PacketDroppingTestWriter();
 
   ~PacketDroppingTestWriter() override;
 
   // Must be called before blocking, reordering or delaying (loss is OK). May be
   // called after connecting if the helper is not available before.
   // |on_can_write| will be triggered when fake-unblocking; ownership will be
@@ skipping 115 matching lines @@
   QuicByteCount buffer_size_;
 
   DISALLOW_COPY_AND_ASSIGN(PacketDroppingTestWriter);
 };
 
 }  // namespace test
 }  // namespace tools
 }  // namespace net
 
 #endif  // NET_TOOLS_QUIC_TEST_TOOLS_PACKET_DROPPING_TEST_WRITER_H_