Add a SetDoNotFragment() method to DatagramSocket, and call this for

net/socket/ssl_server_socket_unittest.cc

 // 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.
 
 // This test suite uses SSLClientSocket to test the implementation of
 // SSLServerSocket. In order to establish connections between the sockets
 // we need two additional classes:
 // 1. FakeSocket
 //    Connects SSL socket to FakeDataChannel. This class is just a stub.
 //
@@ skipping 254 matching lines @@
             const CompletionCallback& callback) override {
     // Write random number of bytes.
     buf_len = rand() % buf_len + 1;
     return outgoing_->Write(buf, buf_len, callback);
   }
 
   int SetReceiveBufferSize(int32_t size) override { return OK; }
 
   int SetSendBufferSize(int32_t size) override { return OK; }
 
+  int SetDoNotFragment(bool do_not_fragment) override { return OK; }
+
   int Connect(const CompletionCallback& callback) override { return OK; }
 
   void Disconnect() override {
     incoming_->Close();
     outgoing_->Close();
   }
 
   bool IsConnected() const override { return true; }
 
   bool IsConnectedAndIdle() const override { return true; }
@@ skipping 833 matching lines @@
   int server_ret = server_socket_->Handshake(handshake_callback.callback());
 
   client_ret = connect_callback.GetResult(client_ret);
   server_ret = handshake_callback.GetResult(server_ret);
 
   ASSERT_THAT(client_ret, IsError(ERR_SSL_VERSION_OR_CIPHER_MISMATCH));
   ASSERT_THAT(server_ret, IsError(ERR_SSL_VERSION_OR_CIPHER_MISMATCH));
 }
 
 }  // namespace net