Unify logic of stack trace generation for extension errors

extensions/renderer/resources/permissions_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.
 
 // Custom binding for the Permissions API.
 
 var binding = require('binding').Binding.create('permissions');
 
 var Event = require('event_bindings').Event;
 
@@ skipping 24 matching lines @@
 
     var args = arguments[0].permissions;
     if (!args)
       return arguments;
 
     for (var i = 0; i < args.length; i += 1) {
       if (typeof(args[i]) == 'object') {
         var a = args[i];
         var keys = $Object.keys(a);
         if (keys.length != 1) {
-          throw new Error("Too many keys in object-style permission.");
+          throw new $Error.self("Too many keys in object-style permission.");

[not at google - send to devlin, 2014/08/19 16:45:56]

new Error() ... I think? This stuff is confusing.

         }
         arguments[0].permissions[i] = keys[0] + '|' +
             JSON.stringify(a[keys[0]]);
       }
     }
 
     return arguments;
   }
 
   // Convert complex permissions to strings so they validate against the schema
@@ skipping 32 matching lines @@
     for (var i = 0; i < args[0].permissions.length; i += 1) {
       args[0].permissions[i] = maybeConvertToObject(args[0].permissions[i]);
     }
     $Function.call(Event.prototype.dispatchToListener, this, callback, args);
   };
   permissions.onRemoved.dispatchToListener =
       permissions.onAdded.dispatchToListener;
 });
 
 exports.binding = binding.generate();