Race preconnects to HTTP2 proxies that support alternate proxies

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 ffb55813a09e6bcfb6876a8cbce7436d682f1b02..8a592a28759c717d3030cbe7818a5ec72814a3f3 100644
--- a/net/http/http_stream_factory_impl_job.h
+++ b/net/http/http_stream_factory_impl_job.h
@@ -215,6 +215,9 @@ class HttpStreamFactoryImpl::Job {
 
   void SetPriority(RequestPriority priority);
 
+  // Sets |num_streams_| to 1 for preconnect jobs.
+  void RestrictNumStreamsToOne();
+
   RequestPriority priority() const { return priority_; }
   bool was_alpn_negotiated() const;
   NextProto negotiated_protocol() const;