[Extensions] Update last_error.js, send_request.js

extensions/renderer/resources/storage_area.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.
 
 var normalizeArgumentsAndValidate =
     require('schemaUtils').normalizeArgumentsAndValidate
 var sendRequest = require('sendRequest').sendRequest;
 
 function extendSchema(schema) {
   var extendedSchema = $Array.slice(schema);
@@ skipping 12 matching lines @@
   var self = this;
   function bindApiFunction(functionName) {
     self[functionName] = function() {
       var funSchema = this.functionSchemas[functionName];
       var args = $Array.slice(arguments);
       args = normalizeArgumentsAndValidate(args, funSchema);
       return sendRequest(
           'storage.' + functionName,
           $Array.concat([namespace], args),
           extendSchema(funSchema.definition.parameters),
-          {preserveNullInObjects: true});
+          {__proto__: null, preserveNullInObjects: true});
     };
   }
   var apiFunctions = ['get', 'set', 'remove', 'clear', 'getBytesInUse'];
   $Array.forEach(apiFunctions, bindApiFunction);
 }
 
 exports.$set('StorageArea', StorageArea);