Rename Toolkit's webextensions component directory to better reflect what it is.

toolkit/components/webextensions/test/mochitest/.eslintrc.js

@@ -0,0 +1,35 @@
+"use strict";
+
+module.exports = { // eslint-disable-line no-undef
+  "extends": "../../../../../testing/mochitest/mochitest.eslintrc.js",
+
+  "env": {
+    "webextensions": true,
+  },
+
+  "globals": {
+    "ChromeWorker": false,
+    "onmessage": true,
+    "sendAsyncMessage": false,
+
+    "waitForLoad": true,
+    "promiseConsoleOutput": true,
+
+    "ExtensionTestUtils": false,
+    "NetUtil": true,
+    "webrequest_test": false,
+    "XPCOMUtils": true,
+
+    // head_webrequest.js symbols
+    "addStylesheet": true,
+    "addLink": true,
+    "addImage": true,
+    "addScript": true,
+    "addFrame": true,
+    "makeExtension": false,
+  },
+
+  "rules": {
+    "no-shadow": 0,
+  },
+};