Actually enable Alternate-Protocol support for QUIC.

net/http/http_stream_factory.cc

Index: net/http/http_stream_factory.cc
diff --git a/net/http/http_stream_factory.cc b/net/http/http_stream_factory.cc
index a48fcb6cd1ff2b1a783e7a8c5951e5b1245562ee..0dbd2966304cf1a600b924660c86db3bc2b7c3f5 100644
--- a/net/http/http_stream_factory.cc
+++ b/net/http/http_stream_factory.cc
@@ -143,6 +143,7 @@ void HttpStreamFactory::EnableNpnSpdy() {
   set_use_alternate_protocols(true);
   std::vector<std::string> next_protos;
   next_protos.push_back("http/1.1");
+  next_protos.push_back("quic");
   next_protos.push_back("spdy/2");
   SetNextProtos(next_protos);
 }
@@ -163,6 +164,7 @@ void HttpStreamFactory::EnableNpnSpdy3() {
   set_use_alternate_protocols(true);
   std::vector<std::string> next_protos;
   next_protos.push_back("http/1.1");
+  next_protos.push_back("quic");
   next_protos.push_back("spdy/2");
   next_protos.push_back("spdy/3");
   SetNextProtos(next_protos);
@@ -173,6 +175,7 @@ void HttpStreamFactory::EnableNpnSpdy31() {
   set_use_alternate_protocols(true);
   std::vector<std::string> next_protos;
   next_protos.push_back("http/1.1");
+  next_protos.push_back("quic");
   next_protos.push_back("spdy/2");
   next_protos.push_back("spdy/3");
   next_protos.push_back("spdy/3.1");