Convert DnsTransactionTest to use SequencedSocketData

net/socket/socket_test_util.cc

Index: net/socket/socket_test_util.cc
diff --git a/net/socket/socket_test_util.cc b/net/socket/socket_test_util.cc
index cf033c245c3e86c8b5c427c2dc061e49172b7a3a..dfd3e633d531a8be170c60f4ed8ecefef13267f4 100644
--- a/net/socket/socket_test_util.cc
+++ b/net/socket/socket_test_util.cc
@@ -600,6 +600,10 @@ void SequencedSocketData::Reset() {
   weak_factory_.InvalidateWeakPtrs();
 }
 
+bool SequencedSocketData::WasDataWritten() const {
+  return helper_.write_index() > 0 || write_state_ != IDLE;
+}
+
 bool SequencedSocketData::at_read_eof() const {
   return helper_.at_read_eof();
 }
@@ -1702,7 +1706,9 @@ MockUDPClientSocket::MockUDPClientSocket(SocketDataProvider* data,
   peer_addr_ = data->connect_data().peer_addr;
 }
 
-MockUDPClientSocket::~MockUDPClientSocket() {}
+MockUDPClientSocket::~MockUDPClientSocket() {
+  data_->set_socket(nullptr);
+}
 
 int MockUDPClientSocket::Read(IOBuffer* buf,
                               int buf_len,