Bug 1292245 - remove some unnecessary imports of chrome from devtools; r=gregtatum

MozReview-Commit-ID: JVVVHAImsko

--HG--
extra : rebase_source : 939fbeb84405bf3740202eb5c0f1ba6c8aae9d92

.eslintignore

@@ -125,9 +125,11 @@ devtools/server/actors/**
 devtools/server/performance/**
 devtools/server/tests/**
 devtools/shared/*.js
+!devtools/shared/async-utils.js
 !devtools/shared/css-lexer.js
 !devtools/shared/defer.js
 !devtools/shared/event-emitter.js
+!devtools/shared/indentation.js
 !devtools/shared/loader-plugin-raw.jsm
 !devtools/shared/task.js
 devtools/shared/*.jsm

devtools/shared/async-utils.js

@@ -13,7 +13,6 @@
  * See Task documentation at https://developer.mozilla.org/en-US/docs/Mozilla/JavaScript_code_modules/Task.jsm.
  */
 
-var {Cu} = require("chrome");
 var {Task} = require("devtools/shared/task");
 var Promise = require("promise");
 
@@ -54,7 +53,7 @@ exports.asyncOnce = function asyncOnce(func) {
  */
 exports.listenOnce = function listenOnce(element, event, useCapture) {
   return new Promise(function (resolve, reject) {
-    var onEvent = function (ev) {
+    let onEvent = function (ev) {
       element.removeEventListener(event, onEvent, useCapture);
       resolve(ev);
     };

devtools/shared/indentation.js

@@ -6,7 +6,6 @@
 
 "use strict";
 
-const { Cu } = require("chrome");
 const Services = require("Services");
 
 const EXPAND_TAB = "devtools.editor.expandtab";