chore(): Use ChromeHeadless by default on test

Author: jamesdaniels

karma.conf.js

@@ -41,7 +41,7 @@ module.exports = function(config) {
     logLevel: config.LOG_INFO,
     autoWatch: true,
     reporters: ['mocha'],
-    browsers: ['Chrome', 'ChromeHeadless', 'Firefox', 'ChromeHeadlessTravis'],
+    browsers: ['ChromeHeadless'],
     singleRun: false,
     customLaunchers: {
       ChromeHeadlessTravis: {