Remove unused method OnPacketSent from QuicPacketDroppingTestWriter::Delegate.

net/tools/quic/end_to_end_test.cc

Index: net/tools/quic/end_to_end_test.cc
diff --git a/net/tools/quic/end_to_end_test.cc b/net/tools/quic/end_to_end_test.cc
index a91b2c74f57e73e841ae04212ffd21914266566d..5fc6ca93be037753934aea8357ce19003f5917ff 100644
--- a/net/tools/quic/end_to_end_test.cc
+++ b/net/tools/quic/end_to_end_test.cc
@@ -211,18 +211,12 @@ vector<TestParams> GetTestParams() {
 
 class ServerDelegate : public PacketDroppingTestWriter::Delegate {
  public:
-  ServerDelegate(TestWriterFactory* writer_factory,
-                 QuicDispatcher* dispatcher)
-      : writer_factory_(writer_factory),
-        dispatcher_(dispatcher) {}
+  explicit ServerDelegate(QuicDispatcher* dispatcher)
+      : dispatcher_(dispatcher) {}
   ~ServerDelegate() override {}
-  void OnPacketSent(WriteResult result) override {
-    writer_factory_->OnPacketSent(result);
-  }
   void OnCanWrite() override { dispatcher_->OnCanWrite(); }
 
  private:
-  TestWriterFactory* writer_factory_;
   QuicDispatcher* dispatcher_;
 };
 
@@ -230,7 +224,6 @@ class ClientDelegate : public PacketDroppingTestWriter::Delegate {
  public:
   explicit ClientDelegate(QuicClient* client) : client_(client) {}
   ~ClientDelegate() override {}
-  void OnPacketSent(WriteResult /*result*/) override {}
   void OnCanWrite() override {
     EpollEvent event(EPOLLOUT, false);
     client_->OnEvent(client_->fd(), &event);
@@ -412,7 +405,7 @@ class EndToEndTest : public ::testing::TestWithParam<TestParams> {
 
     server_writer_->Initialize(
         QuicDispatcherPeer::GetHelper(dispatcher),
-        new ServerDelegate(packet_writer_factory, dispatcher));
+        new ServerDelegate(dispatcher));
     if (stream_factory_ != nullptr) {
       static_cast<QuicTestServer*>(server_thread_->server())
           ->SetSpdyStreamFactory(stream_factory_);