Revert of Remove reference counting from HttpNetworkSession.

net/url_request/url_request_context_storage.h

Index: net/url_request/url_request_context_storage.h
diff --git a/net/url_request/url_request_context_storage.h b/net/url_request/url_request_context_storage.h
index f3b60f711206ab7c34a1a537dd5703346598a9d0..fd3c4a263a97c60555e85736547d5279dd286bfe 100644
--- a/net/url_request/url_request_context_storage.h
+++ b/net/url_request/url_request_context_storage.h
@@ -18,7 +18,6 @@
 class FtpTransactionFactory;
 class HostResolver;
 class HttpAuthHandlerFactory;
-class HttpNetworkSession;
 class HttpServerProperties;
 class HttpTransactionFactory;
 class HttpUserAgentSettings;
@@ -60,8 +59,6 @@
   void set_cookie_store(CookieStore* cookie_store);
   void set_transport_security_state(
       TransportSecurityState* transport_security_state);
-  void set_http_network_session(
-      scoped_ptr<HttpNetworkSession> http_network_session);
   void set_http_transaction_factory(
       HttpTransactionFactory* http_transaction_factory);
   void set_job_factory(URLRequestJobFactory* job_factory);
@@ -70,12 +67,6 @@
   void set_http_user_agent_settings(
       HttpUserAgentSettings* http_user_agent_settings);
   void set_sdch_manager(scoped_ptr<SdchManager> sdch_manager);
-
-  // Everything else can be access through the URLRequestContext, but this
-  // cannot.  Having an accessor for it makes usage a little cleaner.
-  HttpNetworkSession* http_network_session() const {
-    return http_network_session_.get();
-  }
 
  private:
   // We use a raw pointer to prevent reference cycles, since
@@ -99,10 +90,6 @@
   scoped_refptr<CookieStore> cookie_store_;
   scoped_ptr<TransportSecurityState> transport_security_state_;
 
-  // Not actually pointed at by the URLRequestContext, but may be used (but not
-  // owned) by the HttpTransactionFactory.
-  scoped_ptr<HttpNetworkSession> http_network_session_;
-
   scoped_ptr<HttpTransactionFactory> http_transaction_factory_;
   scoped_ptr<URLRequestJobFactory> job_factory_;
   scoped_ptr<URLRequestThrottlerManager> throttler_manager_;