[net/dns] Removes locking from DnsConfigServiceWin and adds local computer name.

net/dns/dns_config_service.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_DNS_DNS_CONFIG_SERVICE_H_
 #define NET_DNS_DNS_CONFIG_SERVICE_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 50 matching lines @@
   // Enable EDNS0 extensions.
   bool edns0;
 };
 
 
 // Service for watching when the system DNS settings have changed.
 // Depending on the platform, watches files in /etc/ or Windows registry.
 class NET_EXPORT_PRIVATE DnsConfigService
   : NON_EXPORTED_BASE(public base::NonThreadSafe) {
  public:
-  // Callback interface for the client. The observer is called on the same
-  // thread as Watch(). Observer must outlive the service.
+  // Callback interface for the client, called on the same thread as Watch().
   typedef base::Callback<void(const DnsConfig& config)> CallbackType;
 
   // Creates the platform-specific DnsConfigService.
   static scoped_ptr<DnsConfigService> CreateSystemService();
 
   DnsConfigService();
   virtual ~DnsConfigService();
 
   // Immediately starts watching system configuration for changes and attempts
   // to read the configuration. For some platform implementations, the current
@@ skipping 38 matching lines @@
   base::OneShotTimer<DnsConfigService> timer_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DnsConfigService);
 };
 
 
 }  // namespace net
 
 #endif  // NET_DNS_DNS_CONFIG_SERVICE_H_