Unify logic of stack trace generation for extension errors

extensions/renderer/resources/test_custom_bindings.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.
 
 // test_custom_bindings.js
 // mini-framework for ExtensionApiTest browser tests
 
 var binding = require('binding').Binding.create('test');
 
 var environmentSpecificBindings = require('test_environment_specific_bindings');
@@ skipping 44 matching lines @@
 
     var called = null;
     return function() {
       if (called != null) {
         var redundantPrefix = 'Error\n';
         chromeTest.fail(
           'Callback has already been run. ' +
           'First call:\n' +
           $String.slice(called, redundantPrefix.length) + '\n' +
           'Second call:\n' +
-          $String.slice(new Error().stack, redundantPrefix.length));
+          $String.slice(new $Error.self().stack, redundantPrefix.length));
       }
-      called = new Error().stack;
+      called = new $Error.self().stack;
 
       pendingCallbacks--;
       if (pendingCallbacks == 0) {
         chromeTest.succeed();
       }
     };
   });
 
   apiFunctions.setHandleRequest('runNextTest', function() {
     // There may have been callbacks which were interrupted by failure
@@ skipping 272 matching lines @@
 
   apiFunctions.setHandleRequest('setExceptionHandler', function(callback) {
     chromeTest.assertEq(typeof(callback), 'function');
     uncaughtExceptionHandler.setHandler(callback);
   });
 
   environmentSpecificBindings.registerHooks(api);
 });
 
 exports.binding = binding.generate();