Random clean up around Chrome OS file manager code.

ui/file_manager/video_player/js/cast/caster.js

 // Copyright 2014 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.
 
 'use strict';
 
 // This hack prevents a bug on the cast extension.
 // TODO(yoshiki): Remove this once the cast extension supports Chrome apps.
 // Although localStorage in Chrome app is not supported, but it's used in the
 // cast extension. This line prevents an exception on using localStorage.
@@ skipping 54 matching lines @@
         console.error('Either "Google Cast API" or "Google Cast" extension ' +
                       'seems not to be installed?');
       }.wrap(), 5000);
 
       window['__onGCastApiAvailable'] = function(loaded, errorInfo) {
         clearTimeout(checkTimer);
 
         if (loaded)
           callback();
         else
-          console.error('Google Cast exntnsion load failed.', errorInfo);
+          console.error('Google Cast extension load failed.', errorInfo);
       }.wrap();
     } else {
       setTimeout(callback);  // Runs asynchronously.
     }
   }.wrap();
 
   script.src = '_modules/mafeflapfdfljijmlienjedomfjfmhpd/cast_sender.js';
   script.addEventListener('error', onError);
   script.addEventListener('load', onLoad);
   document.body.appendChild(script);
@@ skipping 37 matching lines @@
     }
 
     player.setCastList(receivers);
   } else if (availability == chrome.cast.ReceiverAvailability.UNAVAILABLE) {
     player.setCastList([]);
   } else {
     console.error('Unexpected response in onReceiver.', arguments);
     player.setCastList([]);
   }
 }