Process incoming IQs in the same order that they were sent.

remoting/protocol/jingle_session_manager.cc

Index: remoting/protocol/jingle_session_manager.cc
diff --git a/remoting/protocol/jingle_session_manager.cc b/remoting/protocol/jingle_session_manager.cc
index 8758e5dac7de0189e383678a4dd955b015d35d15..f0bf7dff99edf03ced406497076c494d4dc8118c 100644
--- a/remoting/protocol/jingle_session_manager.cc
+++ b/remoting/protocol/jingle_session_manager.cc
@@ -16,6 +16,7 @@
 #include "remoting/signaling/signal_strategy.h"
 #include "third_party/webrtc/base/socketaddress.h"
 #include "third_party/webrtc/libjingle/xmllite/xmlelement.h"
+#include "third_party/webrtc/libjingle/xmpp/constants.h"
 
 using buzz::QName;
 
@@ -132,8 +133,9 @@ bool JingleSessionManager::OnSignalStrategyIncomingStanza(
     return true;
   }
 
-  it->second->OnIncomingMessage(std::move(message), base::Bind(
-      &JingleSessionManager::SendReply, base::Unretained(this), stanza));
+  it->second->OnIncomingMessage(stanza->Attr(buzz::QN_ID), std::move(message),
+                                base::Bind(&JingleSessionManager::SendReply,
+                                           base::Unretained(this), stanza));
   return true;
 }