do more manual cleanup and specify globals

lib/common/asar.js

@@ -1,3 +1,5 @@
+/* globals $, xit */
+
 (function () {
   const asar = process.binding('atom_common_asar')
   const child_process = require('child_process')

lib/renderer/inspector.js

@@ -1,3 +1,5 @@
+/* globals InspectorFrontendHost, WebInspector, DevToolsAPI, DevToolsAPI, Blob */
+
 window.onload = function () {
   // Use menu API to show context menu.
   InspectorFrontendHost.showContextMenuAtPoint = createMenu