Make QUIC's SerializedPacket contain QuicFrames, rather than a pointer

net/quic/quic_utils.cc

Index: net/quic/quic_utils.cc
diff --git a/net/quic/quic_utils.cc b/net/quic/quic_utils.cc
index 2213f0bfa8ffb55e1314a6579aaffb061baf73a8..047cfe2387f87a72f326c9416e5f458b44e872e1 100644
--- a/net/quic/quic_utils.cc
+++ b/net/quic/quic_utils.cc
@@ -455,12 +455,10 @@ void QuicUtils::RemoveFramesForStream(QuicFrames* frames,
 
 // static
 void QuicUtils::ClearSerializedPacket(SerializedPacket* serialized_packet) {
-  if (serialized_packet->retransmittable_frames != nullptr) {
-    DeleteFrames(serialized_packet->retransmittable_frames);
+  if (!serialized_packet->retransmittable_frames.empty()) {
+    DeleteFrames(&serialized_packet->retransmittable_frames);
   }
-  delete serialized_packet->retransmittable_frames;
   delete serialized_packet->packet;
-  serialized_packet->retransmittable_frames = nullptr;
   serialized_packet->packet = nullptr;
 }