Fixed crash involving using NetAddress::Adopt() incorrectly

net/base/address_list.h

 // Copyright (c) 2010 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_BASE_ADDRESS_LIST_H_
 #define NET_BASE_ADDRESS_LIST_H_
 #pragma once
 
 #include <string>
 
 #include "base/ref_counted.h"
 #include "net/base/net_util.h"
 
 struct addrinfo;
 
 namespace net {
 
 // An AddressList object contains a linked list of addrinfo structures.  This
 // class is designed to be copied around by value.
 class AddressList {
  public:
   // Constructs an empty address list.
   AddressList() {}
 
   // Constructs an address list for a single IP literal.  If
   // |canonicalize_name| is true, fill the ai_canonname field with the
   // canonicalized IP address.
   AddressList(const IPAddressNumber& address, int port, bool canonicalize_name);
 
-  // Adopt the given addrinfo list in place of the existing one if any.  This
-  // hands over responsibility for freeing the addrinfo list to the AddressList
-  // object.
+  // Adopt the given addrinfo list (assumed to have been created by
+  // the system, e.g. returned by getaddrinfo()) in place of the
+  // existing one if any.  This hands over responsibility for freeing
+  // the addrinfo list to the AddressList object.
   void Adopt(struct addrinfo* head);
 
   // Copies the given addrinfo rather than adopting it. If |recursive| is true,
   // all linked struct addrinfos will be copied as well. Otherwise only the head
   // will be copied, and the rest of linked entries will be ignored.
   void Copy(const struct addrinfo* head, bool recursive);
 
   // Appends a copy of |head| and all its linked addrinfos to the stored
   // addrinfo.
   void Append(const struct addrinfo* head);
@@ skipping 41 matching lines @@
   };
 
   explicit AddressList(Data* data) : data_(data) {}
 
   scoped_refptr<Data> data_;
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_ADDRESS_LIST_H_