Respect QuicAllowed policy for new streams

chrome/browser/io_thread.h

Index: chrome/browser/io_thread.h
diff --git a/chrome/browser/io_thread.h b/chrome/browser/io_thread.h
index 78102bbcc098d5aeba81f93edc9e53a89253889d..b86b43e4121a56d2453f7f3647e34ea2714b61ba 100644
--- a/chrome/browser/io_thread.h
+++ b/chrome/browser/io_thread.h
@@ -176,6 +176,8 @@ class IOThread : public content::BrowserThreadDelegate {
     std::unique_ptr<net::URLRequestContext> proxy_script_fetcher_context;
     std::unique_ptr<net::ProxyService> system_proxy_service;
     std::unique_ptr<net::HttpNetworkSession> system_http_network_session;
+    std::unique_ptr<net::HttpNetworkSession::SharedParams>
+        http_network_session_shared_params;
     std::unique_ptr<net::HttpTransactionFactory>
         system_http_transaction_factory;
     std::unique_ptr<net::URLRequestJobFactory> system_url_request_job_factory;