NetEq: Change member variables for current RTP types to rtc::Optionals

webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc

Index: webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc
diff --git a/webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc b/webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc
index f6caca34f054c50204c956f497e3f554cf51f578..c74342bb848f34a7221fb3b5cd3d4cbcf7cb294e 100644
--- a/webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc
+++ b/webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc
@@ -287,8 +287,9 @@ TEST_F(NetEqImplTest, InsertPacket) {
       .Times(1);
   EXPECT_CALL(*mock_packet_buffer_, InsertPacketList(_, _, _, _))
       .Times(2)
-      .WillRepeatedly(DoAll(SetArgPointee<2>(kPayloadType),
-                            WithArg<0>(Invoke(DeletePacketsAndReturnOk))));
+      .WillRepeatedly(
+          DoAll(SetArgPointee<2>(rtc::Optional<uint8_t>(kPayloadType)),
+                WithArg<0>(Invoke(DeletePacketsAndReturnOk))));
   // SetArgPointee<2>(kPayloadType) means that the third argument (zero-based
   // index) is a pointer, and the variable pointed to is set to kPayloadType.
   // Also invoke the function DeletePacketsAndReturnOk to properly delete all