Remove unused symbolic link.
diff --git a/.travis.yml b/.travis.yml
index ccdb10f..f71e5f9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,6 +19,5 @@
   - wget http://chromedriver.storage.googleapis.com/2.12/chromedriver_linux64.zip
   - unzip chromedriver_linux64.zip
   - export PATH=$PATH:$PWD
-  - ln -s /usr/bin/chromium-browser google-chrome
 
 script: ./tool/travis.sh