Bug 1463089 - Remove deprecated experimentalObjectRestSpread option from netmonitor's .eslintrc.js file, and clean it up. r=Honza

MozReview-Commit-ID: EiFTniuq3Qy

--HG--
extra : rebase_source : 5c6aabeb38b5dcbd8463d7f95ed6fbf79bf92b09

devtools/client/netmonitor/.eslintrc.js

@@ -5,13 +5,6 @@
 "use strict";
 
 module.exports = {
-  "env": {
-    "browser": true,
-  },
-
-  // Extend from the devtools eslintrc.
-  "extends": "../../.eslintrc.js",
-
   "rules": {
     // The netmonitor is being migrated to HTML and cleaned of
     // chrome-privileged code, so this rule disallows requiring chrome
@@ -20,10 +13,4 @@ module.exports = {
     /* eslint-disable max-len */
     "mozilla/reject-some-requires": ["error", "^(chrome|chrome:.*|resource:.*|devtools/server/.*|.*\\.jsm|devtools/shared/platform/(chome|content)/.*)$"],
   },
-
-  "parserOptions": {
-    "ecmaFeatures": {
-      experimentalObjectRestSpread: true,
-    },
-  },
 };