Remove support for Alt-Svc/Alternate Protocol Probability

net/http/http_network_session.h

Index: net/http/http_network_session.h
diff --git a/net/http/http_network_session.h b/net/http/http_network_session.h
index 30cec77f04d48d0ec4aad019a6abd4dece195f9b..3648a7a0db58da84d9d384ec61236c01582c1450 100644
--- a/net/http/http_network_session.h
+++ b/net/http/http_network_session.h
@@ -101,9 +101,6 @@ class NET_EXPORT HttpNetworkSession
     // Whether to enable Alt-Svc entries with hostname different than that of
     // the origin.
     bool enable_alternative_service_with_different_host;
-    // Only honor alternative service entries which have a higher probability
-    // than this value.
-    double alternative_service_probability_threshold;
 
     // Enables NPN support.  Note that ALPN is always enabled.
     bool enable_npn;