Don't print out extension message data if unrecognized.

remoting/webapp/client_plugin.js

 // 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.
 
 /**
  * @fileoverview
  * Class that wraps low-level details of interacting with the client plugin.
  *
  * This abstracts a <embed> element and controls the plugin which does
  * the actual remoting work. It also handles differences between
@@ skipping 353 matching lines @@
       case 'gnubby-auth':
         this.onGnubbyAuthHandler(extMsgData);
         break;
       case 'test-echo-reply':
         console.log('Got echo reply: ' + extMsgData);
         break;
       case 'cast_message':
         this.onCastExtensionHandler(extMsgData);
         break;
       default:
-        if (!this.onExtensionMessage_(extMsgType, extMsgData)) {
-          console.log('Unexpected message received: ' +
-                      extMsgType + ': ' + extMsgData);
-        }
+        this.onExtensionMessage_(extMsgType, extMsgData);
+        break;
     }
 
   } else if (message.method == 'mediaSourceReset') {
     if (!this.mediaSourceRenderer_) {
       console.error('Unexpected mediaSourceReset.');
       return;
     }
     this.mediaSourceRenderer_.reset(getStringAttr(message.data, 'format'))
 
   } else if (message.method == 'mediaSourceData') {
@@ skipping 429 matching lines @@
  * Undo the CSS rules needed to make the plugin clickable for click-to-play.
  * @private
  */
 remoting.ClientPlugin.prototype.hidePluginForClickToPlay_ = function() {
   this.plugin_.style.width = '';
   this.plugin_.style.height = '';
   this.plugin_.style.top = '';
   this.plugin_.style.left = '';
   this.plugin_.style.position = '';
 };