Step 1 to prepare call_test.* for combined audio/video tests.

webrtc/call/packet_injection_tests.cc

Index: webrtc/call/packet_injection_tests.cc
diff --git a/webrtc/call/packet_injection_tests.cc b/webrtc/call/packet_injection_tests.cc
index 18ca0581d11fb820a6326635cf89e81c2605bc84..315fc7b8f24d808ef8b4c4cf05740cd3d55dda00 100644
--- a/webrtc/call/packet_injection_tests.cc
+++ b/webrtc/call/packet_injection_tests.cc
@@ -42,13 +42,13 @@ void PacketInjectionTest::InjectIncorrectPacket(CodecType codec_type,
   test::NullTransport null_transport;
   CreateSendConfig(1, &null_transport);
   CreateMatchingReceiveConfigs(&null_transport);
-  receive_configs_[0].decoders[0].payload_type = payload_type;
+  video_receive_configs_[0].decoders[0].payload_type = payload_type;
   switch (codec_type) {
     case CodecType::kVp8:
-      receive_configs_[0].decoders[0].payload_name = "VP8";
+      video_receive_configs_[0].decoders[0].payload_name = "VP8";
       break;
     case CodecType::kH264:
-      receive_configs_[0].decoders[0].payload_name = "H264";
+      video_receive_configs_[0].decoders[0].payload_name = "H264";
       break;
   }
   CreateStreams();