Remove the QuicDispatcher's explicit use of EpollServer.

net/tools/quic/test_tools/packet_dropping_test_writer.h

Index: net/tools/quic/test_tools/packet_dropping_test_writer.h
diff --git a/net/tools/quic/test_tools/packet_dropping_test_writer.h b/net/tools/quic/test_tools/packet_dropping_test_writer.h
index b39539f0b4de721330828a6af7763ba7824c3c90..e181fdbfcd8001598af7c8cff5f680c6f4249b93 100644
--- a/net/tools/quic/test_tools/packet_dropping_test_writer.h
+++ b/net/tools/quic/test_tools/packet_dropping_test_writer.h
@@ -43,7 +43,8 @@ class PacketDroppingTestWriter : public QuicPacketWriterWrapper {
   // called after connecting if the helper is not available before.
   // |on_can_write| will be triggered when fake-unblocking; ownership will be
   // assumed.
-  void Initialize(QuicEpollConnectionHelper* helper, Delegate* on_can_write);
+  void Initialize(QuicConnectionHelperInterface* helper,
+                  Delegate* on_can_write);
 
   // QuicPacketWriter methods:
   WriteResult WritePacket(const char* buffer,