remove test-browser-headless

Not ideal to lose Electron testing, but I think this is net win for now.

bin/test.js

@@ -6,11 +6,9 @@ var runSauceLabs = !process.env.CI ||
   (process.env.SAUCE_USERNAME && process.env.SAUCE_ACCESS_KEY)
 
 npmRun('test-node', function () {
-  npmRun('test-browser-headless', function () {
-    if (runSauceLabs) {
-      npmRun('test-browser')
-    }
-  })
+  if (runSauceLabs) {
+    npmRun('test-browser')
+  }
 })
 
 function npmRun (scriptName, onSuccess) {

package.json

@@ -116,7 +116,6 @@
     "build-debug": "browserify -s WebTorrent -e ./ > webtorrent.debug.js",
     "size": "npm run build && cat webtorrent.min.js | gzip | wc -c",
     "test": "standard && node ./bin/test.js",
-    "test-browser-headless": "zuul --electron -- test/*.js test/browser/*.js",
     "test-browser": "airtap -- test/*.js test/browser/*.js",
     "test-browser-local": "airtap --local -- test/*.js test/browser/*.js",
     "test-node": "tape test/*.js test/node/*.js",