[Chromoting] Drop unordered messages instead of crashing

remoting/protocol/jingle_session.cc

Index: remoting/protocol/jingle_session.cc
diff --git a/remoting/protocol/jingle_session.cc b/remoting/protocol/jingle_session.cc
index dc77271e587768205feb7d08d36e69ec41fd4f12..e1d6c66a821d848a28473af828cd8e75ecc76375 100644
--- a/remoting/protocol/jingle_session.cc
+++ b/remoting/protocol/jingle_session.cc
@@ -143,10 +143,13 @@ JingleSession::OrderedMessageQueue::OnIncomingMessage(
   }
 
   // Ensure there are no duplicate sequence ids.
-  DCHECK_GE(current, next_incoming_);
-  DCHECK(queue_.find(current) == queue_.end());
-
-  queue_.insert(std::make_pair(current, std::move(message)));
+  if (current < next_incoming_) {
+    LOG(WARNING) << "An unordered message will be dropped, expected= "
+                 << next_incoming_ << " current= " << current;
+  } else {
+    DCHECK(queue_.find(current) == queue_.end());
+    queue_.insert(std::make_pair(current, std::move(message)));
+  }
 
   auto it = queue_.begin();
   while (it != queue_.end() && it->first == next_incoming_) {