[CrNet] Properly setup net log.

ios/crnet/crnet_environment.h

 // Copyright 2014 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 IOS_CRNET_CRNET_ENVIRONMENT_H_
 #define IOS_CRNET_CRNET_ENVIRONMENT_H_
 
 #include "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #import "ios/crnet/CrNet.h"
-#include "ios/crnet/crnet_net_log.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_context.h"
 
 namespace net {
 class HttpCache;
 class NetworkChangeNotifier;
+class NetLog;
 class ProxyConfigService;
 class SdchManager;
 class URLRequestContextGetter;
+class WriteToFileNetLogObserver;
 }
 
 class CrNetHttpProtocolHandlerDelegate;
 
 // CrNetEnvironment contains all the network stack configuration
 // and initialization.
 class CrNetEnvironment {
  public:
   // Must be called on the main thread.
   static void Initialize();
@@ skipping 103 matching lines @@
   scoped_ptr<base::Thread> file_thread_;
   scoped_ptr<base::Thread> file_user_blocking_thread_;
   scoped_ptr<net::SdchManager> sdch_manager_;
   scoped_ptr<net::NetworkChangeNotifier> network_change_notifier_;
   scoped_ptr<net::ProxyConfigService> proxy_config_service_;
   scoped_ptr<net::HttpServerProperties> http_server_properties_;
   scoped_refptr<net::URLRequestContextGetter> main_context_getter_;
   scoped_ptr<net::URLRequestContext> main_context_;
   scoped_ptr<CrNetHttpProtocolHandlerDelegate> http_protocol_handler_delegate_;
   std::string user_agent_product_name_;
-  base::Lock net_log_lock_;
-  bool net_log_started_;
-  scoped_ptr<CrNetNetLog> net_log_;
+  scoped_ptr<net::NetLog> net_log_;
+  scoped_ptr<net::WriteToFileNetLogObserver> net_log_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(CrNetEnvironment);
 };
 
 #endif  // IOS_CRNET_CRNET_ENVIRONMENT_H_