Convert DnsTransactionTest to use SequencedSocketData

net/socket/socket_test_util.h

 // Copyright (c) 2012 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_SOCKET_SOCKET_TEST_UTIL_H_
 #define NET_SOCKET_SOCKET_TEST_UTIL_H_
 
 #include <cstring>
 #include <deque>
 #include <string>
@@ skipping 482 matching lines @@
                       MockWrite* writes,
                       size_t writes_count);
 
   ~SequencedSocketData() override;
 
   // SocketDataProviderBase implementation.
   MockRead OnRead() override;
   MockWriteResult OnWrite(const std::string& data) override;
   void Reset() override;
 
+  // Returns true if any data was written to the socket, even if the write
+  // has not completed.
+  bool WasDataWritten() const;
+
   // Returns true if all data has been read.
   bool at_read_eof() const;
 
   // Returns true if all data has been written.
   bool at_write_eof() const;
 
  private:
   // Defines the state for the read or write path.
   enum IoState {
     IDLE,        // No async operation is in progress.
@@ skipping 865 matching lines @@
 
 extern const char kSOCKS5OkRequest[];
 extern const int kSOCKS5OkRequestLength;
 
 extern const char kSOCKS5OkResponse[];
 extern const int kSOCKS5OkResponseLength;
 
 }  // namespace net
 
 #endif  // NET_SOCKET_SOCKET_TEST_UTIL_H_