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 c958b6428f47e7f70279e51c8306f9ffbef8637d..7cad71f3297f571712a1fc19e7b9b4fc36e9e52c 100644
--- a/chrome/browser/io_thread.h
+++ b/chrome/browser/io_thread.h
@@ -236,6 +236,12 @@ class IOThread : public content::BrowserThreadDelegate {
 
   const net::HttpNetworkSession::Params& NetworkSessionParams() const;
 
+  // Dynamically update network session params.
+  // Applies to the params_ object owned by io_thread and to the
+  // HttpNetworkSession instances owned by io_thread, if they have been already
+  // created.
+  void UpdateNetworkSessionParams(bool quic_enabled);
+
   base::TimeTicks creation_time() const;
 
   // Returns the callback for updating data use prefs.