errors refactore to fullfil lint suggestions

frontend-js/src/main/js/InvalidArgumentError.js

@@ -5,11 +5,11 @@
 var logger = require('./logger');
 
 function InvalidArgumentError(message) {
-  this.name = "InvalidArgumentError";
   this.message = message;
   this.stack = (new Error()).stack;
 }
 
-InvalidArgumentError.prototype = new Error
+InvalidArgumentError.prototype = Object.create(Error.prototype);
+InvalidArgumentError.prototype.constructor = InvalidArgumentError;
 
 module.exports = InvalidArgumentError;

frontend-js/src/main/js/InvalidCredentialsError.js

@@ -5,11 +5,11 @@
 var logger = require('./logger');
 
 function InvalidCredentialsError(message) {
-  this.name = "InvalidCredentialsError";
   this.message = message;
   this.stack = (new Error()).stack;
 }
 
-InvalidCredentialsError.prototype = new Error
+InvalidCredentialsError.prototype = Object.create(Error.prototype);
+InvalidCredentialsError.prototype.constructor = InvalidCredentialsError;
 
 module.exports = InvalidCredentialsError;