Replace QuicEncryptedPacket's fields with equivalents in SerializedPacket.

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 7973e481d983a5f795ddff98a628475132674257..d90af26e67a6c604bf75a419caf9ff25ab23774a 100644
--- a/net/quic/quic_utils.cc
+++ b/net/quic/quic_utils.cc
@@ -458,8 +458,8 @@ void QuicUtils::ClearSerializedPacket(SerializedPacket* serialized_packet) {
   if (!serialized_packet->retransmittable_frames.empty()) {
     DeleteFrames(&serialized_packet->retransmittable_frames);
   }
-  delete serialized_packet->packet;
-  serialized_packet->packet = nullptr;
+  serialized_packet->encrypted_buffer = nullptr;
+  serialized_packet->encrypted_length = 0;
 }
 
 // static
@@ -477,4 +477,10 @@ uint64_t QuicUtils::PackPathIdAndPacketNumber(QuicPathId path_id,
   return path_id_packet_number;
 }
 
+char* QuicUtils::CopyBuffer(const SerializedPacket& packet) {
+  char* dst_buffer = new char[packet.encrypted_length];
+  memcpy(dst_buffer, packet.encrypted_buffer, packet.encrypted_length);
+  return dst_buffer;
+}
+
 }  // namespace net