Revert "Defaulting web driver to Selenium."

config/build.yml

@@ -16,7 +16,7 @@ behat:
   tags: '~ajax&&~experimental&&~lightningextension'
   extra: ''
   # May be chrome, selenium, phantomjs.
-  web-driver: selenium
+  web-driver: chrome
 
 bin.path: vendor/bin
 

src/Robo/Commands/Tests/BehatCommand.php

@@ -161,7 +161,6 @@ protected function launchChrome() {
     $chrome_bin = $this->findChrome();
     $this->checkChromeVersion($chrome_bin);
     $this->logger->info("Launching headless chrome...");
-    $this->logger->warning("Headless Chrome integration is experimental and may not be stable.");
     $this->getContainer()
       ->get('executor')
       ->execute("'$chrome_bin' --headless --disable-gpu --remote-debugging-port={$this->chromePort} https://www.chromestatus.com --disable-web-security --user-data-dir > /dev/null 2>&1")

template/tests/behat/example.local.yml

@@ -25,8 +25,7 @@ local:
     DMore\ChromeExtension\Behat\ServiceContainer\ChromeExtension: ~
     Behat\MinkExtension:
       browser_name: chrome
-      # Change to "default" for headless Chrome.
-      javascript_session: selenium2
+      javascript_session: default
       # configure the base url for your site
       base_url: ${project.local.uri}
       # set default command for "Show last response" step.