download chrome driver

.travis.yml

@@ -2,11 +2,7 @@ language: node_js
 node_js:
   - "9"
 addons:
-  apt:
-    sources:
-      - google-chrome
-    packages:
-      - google-chrome-stable
+  chrome: stable
 language: java
 branches:
   only:
@@ -16,7 +12,9 @@ script:
   - npm install
   - npm run lint && npm run test && npm run make-mock-compiler && npm run build
   - wget http://selenium-release.storage.googleapis.com/3.5/selenium-server-standalone-3.5.3.jar
-  - java -jar selenium-server-standalone-3.5.3.jar &
+  - wget http://chromedriver.storage.googleapis.com/2.30/chromedriver_linux64.zip
+  - unzip ~/chromedriver_linux64.zip
+  - java -Dwebdriver.chrome.driver="chromedriver" -jar selenium-server-standalone-3.5.3.jar &
   - ./ci/browser_tests.sh
 deploy:
   - provider: script