Remove headless flag from Chrome WebDriver

Author: lenacohen

tests/selenium/pbtest.py

@@ -164,7 +164,7 @@ def on_travis(self):
     def chrome_manager(self):
         opts = ChromeOptions()
         opts.add_argument("--load-extension=" + self.extension_path)
-        opts.add_argument("--headless")
+        # opts.add_argument("--headless")
         opts.binary_location = self.browser_path
 
         # TODO not yet in Firefox (w/o hacks anyway):