fix comment

karma.config.js

@@ -78,7 +78,6 @@ module.exports = function(config) {
     // If browser does not capture in given timeout [ms], kill it
     captureTimeout: 60000,
 
-    // force a window size for PhantomJS, because it's usually unreasonably small, resulting in offset problems
     customLaunchers: {
       ChromeHeadless_custom: {
         base: 'ChromeHeadless',