Change the interface of GetAlternativeServicesFor, always return the best Alt-Svc entry.

net/http/http_stream_factory_impl_job.h

Index: net/http/http_stream_factory_impl_job.h
diff --git a/net/http/http_stream_factory_impl_job.h b/net/http/http_stream_factory_impl_job.h
index 81b812a60833e0aab87eed5d1acdcc1a0ac1329e..3b8c8e45bacb4f29263229550565d57ff46472f6 100644
--- a/net/http/http_stream_factory_impl_job.h
+++ b/net/http/http_stream_factory_impl_job.h
@@ -44,6 +44,8 @@ class HttpStreamFactoryImpl::Job {
       RequestPriority priority,
       const SSLConfig& server_ssl_config,
       const SSLConfig& proxy_ssl_config,
+      HostPortPair server,
+      GURL origin_url,
       NetLog* net_log);
   // Constructor for alternative Job.
   Job(HttpStreamFactoryImpl* stream_factory,
@@ -52,6 +54,8 @@ class HttpStreamFactoryImpl::Job {
       RequestPriority priority,
       const SSLConfig& server_ssl_config,
       const SSLConfig& proxy_ssl_config,
+      HostPortPair server,
+      GURL origin_url,
       AlternativeService alternative_service,
       NetLog* net_log);
   ~Job();