Split enable_alternative_service_with_different_host flag.

net/http/http_network_session.cc

Index: net/http/http_network_session.cc
diff --git a/net/http/http_network_session.cc b/net/http/http_network_session.cc
index d39b05903565e0663ffdc8214fcba4342457eba1..ce4be3d21af79d23c091d29ecd91cafa751690bf 100644
--- a/net/http/http_network_session.cc
+++ b/net/http/http_network_session.cc
@@ -96,7 +96,8 @@ HttpNetworkSession::Params::Params()
       spdy_session_max_recv_window_size(kSpdySessionMaxRecvWindowSize),
       spdy_stream_max_recv_window_size(kSpdyStreamMaxRecvWindowSize),
       time_func(&base::TimeTicks::Now),
-      enable_alternative_service_with_different_host(true),
+      enable_http2_alternative_service_with_different_host(false),
+      enable_quic_alternative_service_with_different_host(true),
       enable_alternative_service_for_insecure_origins(false),
       enable_npn(false),
       enable_priority_dependencies(true),