Fix chromoting client crash.

remoting/client/plugin/chromoting_instance.cc

Index: remoting/client/plugin/chromoting_instance.cc
diff --git a/remoting/client/plugin/chromoting_instance.cc b/remoting/client/plugin/chromoting_instance.cc
index 1514466c803f59e613883b6326b878a25f4daacf..8f41791ddeb54cc56cc298dfd884ebd69809352f 100644
--- a/remoting/client/plugin/chromoting_instance.cc
+++ b/remoting/client/plugin/chromoting_instance.cc
@@ -616,7 +616,9 @@ void ChromotingInstance::Disconnect() {
 }
 
 void ChromotingInstance::OnIncomingIq(const std::string& iq) {
-  xmpp_proxy_->OnIq(iq);
+  // Just ignore the message if it's received before Connect() is called.

[alexeypa (please no reviews), 2013/04/08 15:55:29]

nit: Add "It's likely to be a leftover from a previous 
session, so it's safe to ignore it." from the CL description here. Otherwise it
is not obvious why we are doing this.

[Sergey Ulanov, 2013/04/08 19:48:12]

Done.

+  if (xmpp_proxy_)
+    xmpp_proxy_->OnIq(iq);
 }
 
 void ChromotingInstance::ReleaseAllKeys() {