Change QuicStreamRequest::Request() to take a preferred QuicVersion so that

net/http/http_stream_factory_impl_job_controller.h

Index: net/http/http_stream_factory_impl_job_controller.h
diff --git a/net/http/http_stream_factory_impl_job_controller.h b/net/http/http_stream_factory_impl_job_controller.h
index 71bd77afa8717381fb24a8daa7483aba31e37918..32ca2626daf3eb02df264509a4d7be43d2343c31 100644
--- a/net/http/http_stream_factory_impl_job_controller.h
+++ b/net/http/http_stream_factory_impl_job_controller.h
@@ -340,7 +340,7 @@ class HttpStreamFactoryImpl::JobController
   std::unique_ptr<Job> alternative_job_;
   // The alternative service used by |alternative_job_|
   // (or by |main_job_| if |is_preconnect_|.)
-  AlternativeService alternative_service_;
+  AlternativeServiceInfo alternative_service_info_;
 
   // Net error code of the failed alternative job. Set to OK by default.
   int alternative_job_net_error_;