Removes out of date comments (#2077)

Fixes #2052

Author: roblarsen

test/file_content.js

@@ -1,5 +1,3 @@
-/* jshint mocha: true */
-
 import assert from 'assert';
 import fs from 'fs';
 import path from 'path';

test/file_existence.js

@@ -1,5 +1,3 @@
-/* jshint mocha: true */
-
 import assert from 'assert';
 import fs from 'fs';
 import path from 'path';