CookieStore: Remove reference counting.

ios/chrome/browser/ios_chrome_io_thread.h

 // Copyright 2015 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_CHROME_BROWSER_IOS_CHROME_IO_THREAD_H_
 #define IOS_CHROME_BROWSER_IOS_CHROME_IO_THREAD_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 109 matching lines @@
     scoped_ptr<net::HttpAuthPreferences> http_auth_preferences;
     scoped_ptr<net::HttpAuthHandlerFactory> http_auth_handler_factory;
     scoped_ptr<net::HttpServerProperties> http_server_properties;
     scoped_ptr<net::URLRequestBackoffManager> url_request_backoff_manager;
     scoped_ptr<net::ProxyService> system_proxy_service;
     scoped_ptr<net::HttpNetworkSession> system_http_network_session;
     scoped_ptr<net::HttpTransactionFactory> system_http_transaction_factory;
     scoped_ptr<net::URLRequestJobFactory> system_url_request_job_factory;
     scoped_ptr<net::URLRequestContext> system_request_context;
     SystemRequestContextLeakChecker system_request_context_leak_checker;
-    scoped_refptr<net::CookieStore> system_cookie_store;
+    scoped_ptr<net::CookieStore> system_cookie_store;
     scoped_ptr<net::HttpUserAgentSettings> http_user_agent_settings;
     scoped_ptr<net::NetworkQualityEstimator> network_quality_estimator;
     uint16_t testing_fixed_http_port;
     uint16_t testing_fixed_https_port;
     Optional<bool> enable_tcp_fast_open_for_ssl;
 
     Optional<bool> enable_spdy31;
     Optional<bool> enable_http2;
     Optional<bool> parse_alternative_services;
     Optional<bool> enable_alternative_service_with_different_host;
@@ skipping 250 matching lines @@
       system_url_request_context_getter_;
 
   const base::TimeTicks creation_time_;
 
   base::WeakPtrFactory<IOSChromeIOThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IOSChromeIOThread);
 };
 
 #endif  // IOS_CHROME_BROWSER_IOS_CHROME_IO_THREAD_H_