Remove reference counting from HttpNetworkSession.

net/http/http_network_layer.h

Index: net/http/http_network_layer.h
diff --git a/net/http/http_network_layer.h b/net/http/http_network_layer.h
index 23b4e1eb2dba45c065fed2f38d9c6f9784c88f60..238d205431510b9854868ce2be45212d9f24c848 100644
--- a/net/http/http_network_layer.h
+++ b/net/http/http_network_layer.h
@@ -26,18 +26,11 @@ class NET_EXPORT HttpNetworkLayer
       NON_EXPORTED_BASE(public base::NonThreadSafe) {
  public:
   // Construct a HttpNetworkLayer with an existing HttpNetworkSession which
-  // contains a valid ProxyService.
+  // contains a valid ProxyService. The HttpTransactionFactory must be destroyed
+  // the HttpNetworkSession.
   explicit HttpNetworkLayer(HttpNetworkSession* session);
   ~HttpNetworkLayer() override;
 
-  // Create a transaction factory that instantiate a network layer over an
-  // existing network session. Network session contains some valuable
-  // information (e.g. authentication data) that we want to share across
-  // multiple network layers. This method exposes the implementation details
-  // of a network layer, use this method with an existing network layer only
-  // when network session is shared.
-  static HttpTransactionFactory* CreateFactory(HttpNetworkSession* session);
-
   // HttpTransactionFactory methods:
   int CreateTransaction(RequestPriority priority,
                         scoped_ptr<HttpTransaction>* trans) override;
@@ -49,7 +42,7 @@ class NET_EXPORT HttpNetworkLayer
   void OnResume() override;
 
  private:
-  const scoped_refptr<HttpNetworkSession> session_;
+  HttpNetworkSession* session_;
   bool suspended_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpNetworkLayer);