Fix bug introduced during replace of list wrapper with std equivalents in r5378.

R=henrika@webrtc.org, pbos@webrtc.org, henrike@webrtc.org
TBR=henrike@webrtc.org
BUG=2164

Review URL: https://webrtc-codereview.appspot.com/7639004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5437 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_conference_mixer/source/audio_conference_mixer_impl.cc b/webrtc/modules/audio_conference_mixer/source/audio_conference_mixer_impl.cc
index 2140684..75548a6 100644
--- a/webrtc/modules/audio_conference_mixer/source/audio_conference_mixer_impl.cc
+++ b/webrtc/modules/audio_conference_mixer/source/audio_conference_mixer_impl.cc
@@ -697,7 +697,7 @@
                     mixParticipantList->erase(replaceFrame->id_);
                     activeList.erase(replaceItem);
 
-                    activeList.push_front(*replaceItem);
+                    activeList.push_front(audioFrame);
                     (*mixParticipantList)[audioFrame->id_] = *participant;
                     assert(mixParticipantList->size() <=
                            kMaximumAmountOfMixedParticipants);