Try chrome in travis behat tests.

.travis.yml

@@ -35,7 +35,7 @@ before_install:
 
 install:
   - moodle-plugin-ci install
-  - docker run -d -p 127.0.0.1:4444:4444 --net=host --shm-size=2g -v $HOME/build/moodle:$HOME/build/moodle selenium/standalone-firefox:2.53.1
+  - docker run -d -p 127.0.0.1:4444:4444 --net=host --shm-size=2g -v $HOME/build/moodle:$HOME/build/moodle selenium/standalone-chrome:3
 
 script:
   - moodle-plugin-ci phplint
@@ -48,4 +48,4 @@ script:
   - moodle-plugin-ci grunt
   - moodle-plugin-ci phpdoc
   - moodle-plugin-ci phpunit
-  - moodle-plugin-ci behat
+  - moodle-plugin-ci behat --profile chrome