JobController: do not create alternative job for those AlternativeServiceInfo

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 f4779534d2c4f0597853dcaa2027436cd0c4589e..71bd77afa8717381fb24a8daa7483aba31e37918 100644
--- a/net/http/http_stream_factory_impl_job_controller.h
+++ b/net/http/http_stream_factory_impl_job_controller.h
@@ -277,6 +277,13 @@ class HttpStreamFactoryImpl::JobController
       HttpStreamRequest::Delegate* delegate,
       HttpStreamRequest::StreamType stream_type);
 
+  // Returns a QuicVersion that has been advertised in |advertised_versions|
+  // and is supported.  If more than one QuicVersions are supported, the first
+  // matched in the supported versions will be returned.  If no mutually
+  // supported version is found, QUIC_VERSION_UNSUPPORTED_VERSION will be
+  // returned.
+  QuicVersion SelectQuicVersion(const QuicVersionVector& advertised_versions);
+
   // Remove session from the SpdySessionRequestMap.
   void RemoveRequestFromSpdySessionRequestMap();