Remove reference counting from HttpNetworkSession.

ios/web/shell/shell_url_request_context_getter.cc

Index: ios/web/shell/shell_url_request_context_getter.cc
diff --git a/ios/web/shell/shell_url_request_context_getter.cc b/ios/web/shell/shell_url_request_context_getter.cc
index 8de48364a27338e1c72bc23a1524ffcc8e1a4631..2f862c0284333c4a05841c568009f1c2721a2b36 100644
--- a/ios/web/shell/shell_url_request_context_getter.cc
+++ b/ios/web/shell/shell_url_request_context_getter.cc
@@ -135,8 +135,11 @@ net::URLRequestContext* ShellURLRequestContextGetter::GetURLRequestContext() {
                                            net::CACHE_BACKEND_DEFAULT,
                                            cache_path, 0, cache_task_runner_);
 
+    storage_->set_http_network_session(
+        make_scoped_ptr(new net::HttpNetworkSession(network_session_params)));
     storage_->set_http_transaction_factory(make_scoped_ptr(
-        new net::HttpCache(network_session_params, main_backend)));
+        new net::HttpCache(storage_->http_network_session(), main_backend,
+                           true /* set_up_quic_server_info */)));
 
     scoped_ptr<net::URLRequestJobFactoryImpl> job_factory(
         new net::URLRequestJobFactoryImpl());