Move RtcEventLog object from inside VoiceEngine to Call.

webrtc/audio/audio_send_stream_unittest.cc

Index: webrtc/audio/audio_send_stream_unittest.cc
diff --git a/webrtc/audio/audio_send_stream_unittest.cc b/webrtc/audio/audio_send_stream_unittest.cc
index c04a3de77c203e00aedeb67b34c0115f7fcdf68b..e0374c59e1384a3e5feea985179c587107bd590f 100644
--- a/webrtc/audio/audio_send_stream_unittest.cc
+++ b/webrtc/audio/audio_send_stream_unittest.cc
@@ -55,7 +55,8 @@ struct ConfigHelper {
         stream_config_(nullptr),
         congestion_controller_(&simulated_clock_,
                                &bitrate_observer_,
-                               &remote_bitrate_observer_) {
+                               &remote_bitrate_observer_,
+                               nullptr) {
     using testing::Invoke;
     using testing::StrEq;