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

net/test/local_test_server.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_LOCAL_TEST_SERVER_H_
 #define NET_TEST_LOCAL_TEST_SERVER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 17 matching lines @@
   // |document_root| must be a relative path under the root tree.
   LocalTestServer(Type type,
                   const std::string& host,
                   const FilePath& document_root);
 
   // Initialize a HTTPS TestServer with a specific set of HTTPSOptions.
   // |document_root| must be a relative path under the root tree.
   LocalTestServer(const HTTPSOptions& https_options,
                   const FilePath& document_root);
 
-  ~LocalTestServer();
+  virtual ~LocalTestServer();
 
   bool Start() WARN_UNUSED_RESULT;
 
   // Stop the server started by Start().
   bool Stop();
 
  private:
   bool Init(const FilePath& document_root);
 
   // Modify PYTHONPATH to contain libraries we need.
@@ skipping 29 matching lines @@
   file_util::ScopedFD child_fd_closer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(LocalTestServer);
 };
 
 }  // namespace net
 
 #endif  // NET_TEST_LOCAL_TEST_SERVER_H_