Update selenium tests' dependencies

Dockerfile-selenium

@@ -1,7 +1,7 @@
 # Copyright (C) 2018 Google Inc.
 # Licensed under http://www.apache.org/licenses/LICENSE-2.0 <see LICENSE file>
 
-ARG CHROME_CT_VERSION="3.11.0"
+ARG CHROME_CT_VERSION="3.13.0"
 FROM selenium/standalone-chrome:${CHROME_CT_VERSION}
 
 USER root
@@ -19,7 +19,7 @@ USER seluser
 
 # Specify version of Chrome webdriver using 'CHROME_DRIVER_VERSION' argument
 # Latest released version will be used by default
-ARG CHROME_DRIVER_VERSION="2.37"
+ARG CHROME_DRIVER_VERSION="2.41"
 RUN CD_VER=$(if [ ${CHROME_DRIVER_VERSION:-latest} = "latest" ]; then echo\
   $(wget -qO- https://chromedriver.storage.googleapis.com/LATEST_RELEASE); \
   else echo $CHROME_DRIVER_VERSION; fi) \

src/requirements-selenium.txt

@@ -3,16 +3,16 @@
 
 inflection==0.3.1
 nerodia==0.9.0
-pytest==3.5.0
+pytest==3.6.4
 pytest-cov==2.5.1
 pytest-env==0.6.2
-pytest-html==1.17.0
+pytest-html==1.19.0
 pytest-pycharm==0.5.0
-pytest-repeat==0.4.1
-pytest-rerunfailures==4.0
-pytest-selenium==1.12.0
-pytest-xdist==1.22.2
-python-dateutil==2.7.1
-requests==2.18.4
-selenium==3.11.0
+pytest-repeat==0.6.0
+pytest-rerunfailures==4.1
+pytest-selenium==1.13.0
+pytest-xdist==1.22.5
+python-dateutil==2.7.3
+requests==2.19.1
+selenium==3.14.0
 waiting==1.4.1

test/selenium/src/lib/utils/selenium_utils.py

@@ -352,16 +352,9 @@ def set_chrome_download_location(driver, download_dir):
   """Headless Chrome doesn't support download.default_directory preference.
   Downloads are disallowed by default.
   In order to allow a download we should send a command that will allow them.
-  Language bindings currently don't have this possibility.
   """
-  # pylint: disable=protected-access
-  driver.command_executor._commands["send_command"] = (
-      "POST", "/session/{}/chromium/send_command".format(driver.session_id))
-  params = {
-      "cmd": "Page.setDownloadBehavior",
-      "params": {"behavior": "allow", "downloadPath": download_dir}
-  }
-  driver.execute("send_command", params)
+  cmd_args = {"behavior": "allow", "downloadPath": download_dir}
+  driver.execute_cdp_cmd("Page.setDownloadBehavior", cmd_args)
 
 
 def is_headless_chrome(pytestconfig):