Remove the previous headers_stream_ and Change unowned_headers_stream_ to header_stream_.

The unique_ptr headers_stream is now only used as a temporary variable to pass into stream_map. No need to have it as a member variable anymore.

gfe-relnote: No behavior change. Not protected.
PiperOrigin-RevId: 258403361
Change-Id: Idefbab511707878e6904c58f0aaef7c4f205f710
diff --git a/quic/test_tools/quic_spdy_session_peer.cc b/quic/test_tools/quic_spdy_session_peer.cc
index be0849b..68552a8 100644
--- a/quic/test_tools/quic_spdy_session_peer.cc
+++ b/quic/test_tools/quic_spdy_session_peer.cc
@@ -16,15 +16,13 @@
   return session->headers_stream();
 }
 
-void QuicSpdySessionPeer::SetUnownedHeadersStream(
-    QuicSpdySession* session,
-    QuicHeadersStream* headers_stream) {
+void QuicSpdySessionPeer::SetHeadersStream(QuicSpdySession* session,
+                                           QuicHeadersStream* headers_stream) {
   for (auto& it : session->stream_map()) {
     if (it.first == QuicUtils::GetHeadersStreamId(
                         session->connection()->transport_version())) {
       it.second.reset(headers_stream);
-      session->unowned_headers_stream_ =
-          static_cast<QuicHeadersStream*>(it.second.get());
+      session->headers_stream_ = static_cast<QuicHeadersStream*>(it.second.get());
       break;
     }
   }