test: remove chrome from karma

Author: eddyerburgh

Diff for: package.json

@@ -53,7 +53,6 @@
     "jsdom": "^11.5.1",
     "jsdom-global": "^3.0.2",
     "karma": "^1.7.0",
-    "karma-chrome-launcher": "^2.2.0",
     "karma-mocha": "^1.3.0",
     "karma-phantomjs-launcher": "^1.0.4",
     "karma-sinon-chai": "^1.3.1",

Diff for: test/setup/karma.conf.js

@@ -2,7 +2,7 @@ const webpackConfig = require('./webpack.test.config.js')
 
 module.exports = function (config) {
   config.set({
-    browsers: ['PhantomJS', 'ChromeHeadless'],
+    browsers: ['PhantomJS'],
     frameworks: ['mocha', 'sinon-chai'],
     reporters: ['spec'],
     files: [