Fix crash when user disconnects It2Me host

remoting/client/plugin/chromoting_instance.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/client/plugin/chromoting_instance.h"
 
 #include <nacl_io/nacl_io.h>
 #include <sys/mount.h>
 
 #include <string>
@@ skipping 714 matching lines @@
 void ChromotingInstance::HandleOnIncomingIq(const base::DictionaryValue& data) {
   std::string iq;
   if (!data.GetString("iq", &iq)) {
     LOG(ERROR) << "Invalid incomingIq() data.";
     return;
   }
 
   // Just ignore the message if it's received before Connect() is called. It's
   // likely to be a leftover from a previous session, so it's safe to ignore it.
   if (signal_strategy_)
-    signal_strategy_->OnIncomingMessage(iq);
+    signal_strategy_->GetIncomingMessageCallback().Run(iq);
 }
 
 void ChromotingInstance::HandleReleaseAllKeys(
     const base::DictionaryValue& data) {
   if (IsConnected())
     input_tracker_.ReleaseAll();
 }
 
 void ChromotingInstance::HandleInjectKeyEvent(
       const base::DictionaryValue& data) {
@@ skipping 385 matching lines @@
   if (is_custom_counts_histogram) {
     uma.HistogramCustomCounts(histogram_name, value, histogram_min,
                               histogram_max, histogram_buckets);
   } else {
     uma.HistogramCustomTimes(histogram_name, value, histogram_min,
                              histogram_max, histogram_buckets);
   }
 }
 
 }  // namespace remoting