diff --git a/lib/browser/api/dialog.js b/lib/browser/api/dialog.js
index f775b9e9cf20..c9f713a28736 100644
--- a/lib/browser/api/dialog.js
+++ b/lib/browser/api/dialog.js
@@ -15,32 +15,6 @@ const fileDialogProperties = {
   treatPackageAsDirectory: 1 << 7
 }
 
-const messageBoxTypes = ['none', 'info', 'warning', 'error', 'question']
-
-const messageBoxOptions = {
-  noLink: 1 << 0
-}
-
-const parseArgs = function (window, options, callback, ...args) {
-  if (window != null && window.constructor !== BrowserWindow) {
-    // Shift.
-    [callback, options, window] = [options, window, null]
-  }
-
-  if ((callback == null) && typeof options === 'function') {
-    // Shift.
-    [callback, options] = [options, null]
-  }
-
-  // Fallback to using very last argument as the callback function
-  const lastArgument = args[args.length - 1]
-  if ((callback == null) && typeof lastArgument === 'function') {
-    callback = lastArgument
-  }
-
-  return [window, options, callback]
-}
-
 const normalizeAccessKey = (text) => {
   if (typeof text !== 'string') return text
 
@@ -144,6 +118,9 @@ const messageBox = (sync, window, options) => {
   if (window && window.constructor !== BrowserWindow) options = window
   if (options == null) options = { type: 'none' }
 
+  const messageBoxTypes = ['none', 'info', 'warning', 'error', 'question']
+  const messageBoxOptions = { noLink: 1 << 0 }
+
   let {
     buttons = [],
     cancelId,