Return Request as unique_ptr from JobController::Start().

net/http/bidirectional_stream.cc

Index: net/http/bidirectional_stream.cc
diff --git a/net/http/bidirectional_stream.cc b/net/http/bidirectional_stream.cc
index c984b53eb1581704ee9eb63abb020e72fd4bb5ba..92d550df77089bc9c46e8283319b512b6326b410 100644
--- a/net/http/bidirectional_stream.cc
+++ b/net/http/bidirectional_stream.cc
@@ -120,12 +120,12 @@ BidirectionalStream::BidirectionalStream(
   http_request_info.url = request_info_->url;
   http_request_info.method = request_info_->method;
   http_request_info.extra_headers = request_info_->extra_headers;
-  stream_request_.reset(
+  stream_request_ =
       session->http_stream_factory()->RequestBidirectionalStreamImpl(
           http_request_info, request_info_->priority, server_ssl_config,
           server_ssl_config, this,
           /* enable_ip_based_pooling = */ true,
-          /* enable_alternative_services = */ true, net_log_));
+          /* enable_alternative_services = */ true, net_log_);
   // Check that this call cannot fail to set a non-NULL |stream_request_|.
   DCHECK(stream_request_);
   // Check that HttpStreamFactory does not invoke OnBidirectionalStreamImplReady