Make the externally connectable browser test clobber all of the builtins,

chrome/renderer/resources/extensions/bluetooth_custom_bindings.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.
 
 // Custom binding for the Bluetooth API.
 
 var binding = require('binding').Binding.create('bluetooth');
 
 var chrome = requireNative('chrome').GetChrome();
 var Event = require('event_bindings').Event;
@@ skipping 103 matching lines @@
     removeDeviceSearchListeners();
     bluetooth.getDevicesState = null;
 
     if (finalCallback) {
       finalCallback();
     }
   }
 
   apiFunctions.setUpdateArgumentsPostValidate('getDevices',
       function() {
-        var args = Array.prototype.slice.call(arguments);
+        var args = $Array.slice(arguments);
 
         if (bluetooth.getDevicesState != null) {
           throw new Error('Concurrent calls to getDevices are not allowed.');
         }
 
         var state = { actualEvents: 0 };
 
         if (typeof(args[args.length - 1]) == 'function') {
           state.finalCallback = args.pop();
-          args.push(
+          $Array.push(args,
               function() {
                 if (chrome.runtime.lastError) {
                   finishDeviceSearch();
                 }
               });
         } else {
           throw new Error('getDevices must have a final callback parameter.');
         }
 
         if (typeof(args[0].deviceCallback) == 'function') {
           state.deviceCallback = args[0].deviceCallback;
         } else {
           throw new Error('getDevices must be passed options with a ' +
               'deviceCallback.');
         }
 
         bluetooth.getDevicesState = state;
         addDeviceSearchListeners();
 
         return args;
       });
 });
 
 exports.binding = binding.generate();