Find the chromium instance correctly

The chromium binary is actually a script that starts the /usr/lib/chromium binary
with the correct arguments. We just need to search for the chromium instance that
doesn't have a '--type' parameter

lib/local/platform/unix.js

@@ -3,7 +3,7 @@ var path = require('path');
 module.exports = {
   chrome: {
     pathQuery: 'which chromium-browser chromium google-chrome google-chrome-stable | head -n1',
-    process: 'chrome',
+    process: 'chrom(e|ium( --(?!type)[^=]+=[^ ]+)*)',
     opensTab: true,
     args: ['--no-first-run']
   },