Try config from mediawiki-selenium-rb.

Reference:
travis-ci/travis-ci#272 (comment)

.travis.yml

@@ -1,17 +1,15 @@
 sudo: required
 dist: trusty
-addons:
-  apt:
-    sources:
-      - google-chrome
-    packages:
-      - google-chrome-stable
 language: node_js
 node_js:
   - "6"
+before_install:
+  - sudo apt-get update
+  - sudo apt-get install chromium-chromedriver
 before_script:
-  - export DISPLAY=:99.0
-  - sh -e /etc/init.d/xvfb start
+  - "export PATH=$PATH:/usr/lib/chromium-browser/"
+  - "export DISPLAY=:99.0"
+  - "sh -e /etc/init.d/xvfb start"
   - sleep 3
 script:
   - npm run lint