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 257a127a40677fb6e9dfc9c65d9fc56bf03ffd57..5bf834ad3917b3f93a9337726cec701d151a9a7e 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 disables QUIC for HttpNetworkSessions owned by io_thread, and
+  // to HttpNetworkSession::Params which are used for the creation of new
+  // HttpNetworkSessions. Not that re-enabling Quic dynamically is not
+  // supported for simplicity and requires a browser restart.
+  void DisableQuic();
+
   base::TimeTicks creation_time() const;
 
   // Returns the callback for updating data use prefs.