Fixup error message shown when Chromoting is not enabled properly.

remoting/webapp/me2mom/remoting_session.js

 // Copyright (c) 2011 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.
 
 var remoting = chrome.extension.getBackgroundPage().remoting;
 
 // Chromoting session API version (for this javascript).
 // This is compared with the plugin API version to verify that they are
 // compatible.
 remoting.apiVersion = 2;
@@ skipping 116 matching lines @@
   }
 
   // Setup the callback that the plugin will call when the connection status
   // has changes and the UI needs to be updated. It needs to be an object with
   // a 'callback' property that contains the callback function.
   plugin.connectionInfoUpdate = connectionInfoUpdateCallback;
   plugin.debugInfo = debugInfoCallback;
   plugin.desktopSizeUpdate = desktopSizeChanged;
   plugin.loginChallenge = loginChallengeCallback;
 
+  if (typeof plugin.connect !== 'function') {
+    setClientStateMessage("Unable to load plugin. Please make sure that " +
+        "'Remoting' and 'P2P API' are enabled in chrome://flags.");
+    return;
+  }
+
   if (!checkVersion(plugin)) {
     // TODO(garykac): We need better messaging here. Perhaps an install link.
     setClientStateMessage("Out of date. Please re-install.");
     return;
   }
 
   addToDebugLog('Connect as user ' + remoting.username);
-
-  // TODO(garykac): Clean exit if |connect| isn't a function.
-  if (typeof plugin.connect === 'function') {
-    registerConnection();
-  } else {
-    addToDebugLog('ERROR: remoting plugin not loaded');
-    setClientStateMessage('Plugin not loaded');
-  }
-
+  registerConnection();
 }
 
 function toggleScaleToFit() {
   remoting.scaleToFit = !remoting.scaleToFit;
   document.getElementById('scale-to-fit-toggle').value =
       remoting.scaleToFit ? 'No scaling' : 'Scale to fit';
   remoting.plugin.setScaleToFit(remoting.scaleToFit);
 }
 
 /**
@@ skipping 147 matching lines @@
       'Bandwidth: ' + videoBandwidth.toFixed(2) + units +
       ', Capture: ' + videoCaptureLatency.toFixed(2) + 'ms' +
       ', Encode: ' + videoEncodeLatency.toFixed(2) + 'ms' +
       ', Decode: ' + videoDecodeLatency.toFixed(2) + 'ms' +
       ', Render: ' + videoRenderLatency.toFixed(2) + 'ms' +
       ', Latency: ' + roundTripLatency.toFixed(2) + 'ms');
 
   // Update the stats once per second.
   window.setTimeout('updateStatusBarStats()', 1000);
 }