Replace QuicEncryptedPacket's fields with equivalents in SerializedPacket.

net/quic/quic_utils.h

Index: net/quic/quic_utils.h
diff --git a/net/quic/quic_utils.h b/net/quic/quic_utils.h
index 3965c6580540dc7ac99d2413a995f1f12693ab29..b73603cd38cb22544b5d7e22e8161c9b2ed4a86a 100644
--- a/net/quic/quic_utils.h
+++ b/net/quic/quic_utils.h
@@ -120,6 +120,10 @@ class NET_EXPORT_PRIVATE QuicUtils {
   static uint64_t PackPathIdAndPacketNumber(QuicPathId path_id,
                                             QuicPacketNumber packet_number);
 
+  // Allocates a new char[] of size |packet.encrypted_length| and copies in
+  // |packet.encrypted_buffer|.
+  static char* CopyBuffer(const SerializedPacket& packet);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(QuicUtils);
 };