Revert of Fixes use-after-free bug in QUIC.

net/quic/test_tools/quic_session_peer.cc

Index: net/quic/test_tools/quic_session_peer.cc
diff --git a/net/quic/test_tools/quic_session_peer.cc b/net/quic/test_tools/quic_session_peer.cc
index a2d624777a9a15fc2bf254fa8bce58eb0a28bebc..04f59123d76f904981cbf333f950848055d20329 100644
--- a/net/quic/test_tools/quic_session_peer.cc
+++ b/net/quic/test_tools/quic_session_peer.cc
@@ -66,6 +66,11 @@
 }
 
 // static
+QuicSession::StreamMap& QuicSessionPeer::dynamic_streams(QuicSession* session) {
+  return session->dynamic_streams();
+}
+
+// static
 std::unordered_set<QuicStreamId>* QuicSessionPeer::GetDrainingStreams(
     QuicSession* session) {
   return &session->draining_streams_;