Bug 1782008 - Remove now unnecessary .eslintrc.js files....

Bug 1782008 - Remove now unnecessary .eslintrc.js files. r=webcompat-reviewers,extension-reviewers,media-playback-reviewers,pip-reviewers,denschub,rpl,alwu,mossop

Differential Revision: https://phabricator.services.mozilla.com/D152736

accessible/tests/crashtests/.eslintrc.js

-"use strict";
-
-module.exports = {
-  "extends": [
-    "plugin:mozilla/mochitest-test"
-  ],
-};

browser/base/content/test/about/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};

browser/base/content/test/alerts/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};

browser/base/content/test/backforward/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};

browser/base/content/test/caps/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};

browser/base/content/test/captivePortal/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};

browser/base/content/test/contentTheme/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};

browser/base/content/test/contextMenu/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};

browser/base/content/test/favicons/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test", "plugin:mozilla/mochitest-test"],
-};

browser/base/content/test/forms/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};

browser/base/content/test/fullscreen/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};

browser/base/content/test/general/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test", "plugin:mozilla/mochitest-test"],
-};

browser/base/content/test/gesture/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};

browser/base/content/test/historySwipeAnimation/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};

browser/base/content/test/keyboard/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};

browser/base/content/test/menubar/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};

browser/base/content/test/metaTags/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};

browser/base/content/test/notificationbox/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};

browser/base/content/test/outOfProcess/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};

browser/base/content/test/pageActions/.eslintrc.js

-"use strict";
-
-module.exports = {
-  extends: ["plugin:mozilla/browser-test"],
-};