Upgrade Chrome major to 68.0.3440.75

https://chromereleases.googleblog.com/2018/07/stable-channel-update-for-desktop.html

Author: elgalu

Dockerfile

@@ -637,7 +637,7 @@ COPY bin/fail /usr/bin/
 #===============
 # TODO: Use Google fingerprint to verify downloads
 #  https://www.google.de/linuxrepositories/
-ARG EXPECTED_CHROME_VERSION="67.0.3396.99"
+ARG EXPECTED_CHROME_VERSION="68.0.3440.75"
 ENV CHROME_URL="https://dl.google.com/linux/direct" \
     CHROME_BASE_DEB_PATH="/home/seluser/chrome-deb/google-chrome" \
     GREP_ONLY_NUMS_VER="[0-9.]{2,20}"