Cleanup the CoffeeScript converted code

lib/browser/api/web-contents.js

@@ -11,12 +11,11 @@ const binding = process.atomBinding('web_contents')
 const debuggerBinding = process.atomBinding('debugger')
 
 let nextId = 0
-
-let getNextId = function () {
+const getNextId = function () {
   return ++nextId
 }
 
-let PDFPageSize = {
+const PDFPageSize = {
   A5: {
     custom_display_name: 'A5',
     height_microns: 210000,
@@ -64,9 +63,9 @@ const webFrameMethods = [
   'setZoomLevelLimits'
 ]
 
-let wrapWebContents = function (webContents) {
+// Add JavaScript wrappers for WebContents class.
+const wrapWebContents = function (webContents) {
   // webContents is an EventEmitter.
-  var controller, method, name, ref1
   Object.setPrototypeOf(webContents, EventEmitter.prototype)
 
   // Every remote callback from renderer process would add a listenter to the
@@ -85,21 +84,18 @@ let wrapWebContents = function (webContents) {
   webContents.sendToAll = sendWrapper.bind(null, true)
 
   // The navigation controller.
-  controller = new NavigationController(webContents)
-  ref1 = NavigationController.prototype
-  for (name in ref1) {
-    method = ref1[name]
+  const controller = new NavigationController(webContents)
+  for (const name in NavigationController.prototype) {
+    const method = NavigationController.prototype[name]
     if (method instanceof Function) {
-      (function (name, method) {
-        webContents[name] = function () {
-          return method.apply(controller, arguments)
-        }
-      })(name, method)
+      webContents[name] = function () {
+        return method.apply(controller, arguments)
+      }
     }
   }
 
   // Mapping webFrame methods.
-  for (let method of webFrameMethods) {
+  for (const method of webFrameMethods) {
     webContents[method] = function (...args) {
       this.send('ELECTRON_INTERNAL_RENDERER_WEB_FRAME_METHOD', method, args)
     }
@@ -115,7 +111,7 @@ let wrapWebContents = function (webContents) {
   // Make sure webContents.executeJavaScript would run the code only when the
   // webContents has been loaded.
   webContents.executeJavaScript = function (code, hasUserGesture, callback) {
-    let requestId = getNextId()
+    const requestId = getNextId()
     if (typeof hasUserGesture === 'function') {
       callback = hasUserGesture
       hasUserGesture = false
@@ -131,18 +127,16 @@ let wrapWebContents = function (webContents) {
 
   // Dispatch IPC messages to the ipc module.
   webContents.on('ipc-message', function (event, [channel, ...args]) {
-    ipcMain.emit.apply(ipcMain, [channel, event].concat(args))
+    ipcMain.emit(channel, event, ...args)
   })
   webContents.on('ipc-message-sync', function (event, [channel, ...args]) {
     Object.defineProperty(event, 'returnValue', {
       set: function (value) {
         return event.sendReply(JSON.stringify(value))
       },
-      get: function () {
-        return undefined
-      }
+      get: function () {}
     })
-    return ipcMain.emit.apply(ipcMain, [channel, event].concat(args))
+    ipcMain.emit(channel, event, ...args)
   })
 
   // Handle context menu action request from pepper plugin.
@@ -164,8 +158,7 @@ let wrapWebContents = function (webContents) {
   })
 
   webContents.printToPDF = function (options, callback) {
-    var printingSetting
-    printingSetting = {
+    const printingSetting = {
       pageRage: [],
       mediaSize: {},
       landscape: false,
@@ -229,13 +222,14 @@ let wrapWebContents = function (webContents) {
   }
 }
 
-// Wrapper for native class.
-let wrapDebugger = function (webContentsDebugger) {
+binding._setWrapWebContents(wrapWebContents)
+
+// Add JavaScript wrappers for Debugger class.
+const wrapDebugger = function (webContentsDebugger) {
   // debugger is an EventEmitter.
   Object.setPrototypeOf(webContentsDebugger, EventEmitter.prototype)
 }
 
-binding._setWrapWebContents(wrapWebContents)
 debuggerBinding._setWrapDebugger(wrapDebugger)
 
 module.exports = {