Make the SpawnerCommunicator destructor virtual since it inherits from net::URLRequest::Delegate

net/test/spawner_communicator.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_TEST_SPAWNER_COMMUNICATOR_H_
 #define NET_TEST_SPAWNER_COMMUNICATOR_H_
 #pragma once
 
 #include <string>
 
@@ skipping 44 matching lines @@
 // Method: "GET".
 // Data to server: None.
 // Data from server: String "ready" returned if success.
 //
 // The internal I/O thread is required by net stack to perform net I/O.
 // The Start/StopServer methods block the caller thread until result is
 // fetched from spawner server or timed-out.
 class SpawnerCommunicator : public net::URLRequest::Delegate {
  public:
   explicit SpawnerCommunicator(uint16 port);
-  ~SpawnerCommunicator();
+  virtual ~SpawnerCommunicator();
 
   // Starts an instance of the Python test server on the host/ machine.
   // If successfully started, returns true, setting |*port| to the port
   // on the local machine that can be used to communicate with the remote
   // test server.
   bool StartServer(const std::string& arguments,
                    uint16* port) WARN_UNUSED_RESULT;
 
   bool StopServer() WARN_UNUSED_RESULT;
 
@@ skipping 65 matching lines @@
   // Only gets/sets |is_running_| on user's thread to avoid race-condition.
   bool is_running_;
 
   DISALLOW_COPY_AND_ASSIGN(SpawnerCommunicator);
 };
 
 }  // namespace net
 
 #endif  // NET_TEST_SPAWNER_COMMUNICATOR_H_