Remove QuicPacketCreator::AddSavedFrame() and make QuicPacketCreator::AddFrame() public.

gfe-relnote: no behavior change. Not protected.
PiperOrigin-RevId: 281456340
Change-Id: I53bccacca15c04573e3b3fca17f591414e997ba9
diff --git a/quic/core/quic_dispatcher.cc b/quic/core/quic_dispatcher.cc
index 31faade..b9252c8 100644
--- a/quic/core/quic_dispatcher.cc
+++ b/quic/core/quic_dispatcher.cc
@@ -176,7 +176,7 @@
         framer_.transport_version(), error_code, error_details,
         /*transport_close_frame_type=*/0);
 
-    if (!creator_.AddSavedFrame(QuicFrame(frame), NOT_RETRANSMISSION)) {
+    if (!creator_.AddFrame(QuicFrame(frame), NOT_RETRANSMISSION)) {
       QUIC_BUG << "Unable to add frame to an empty packet";
       delete frame;
       return;