Chrome update may have shipped with a bug that damages the file system on macOS machines with System Integrity Protection (SIP) disabled, including machines that do not support SIP.
If you have not taken steps to disable System Integrity Protection and your computer is on OS X 10.11 or later, this issue cannot affect you.
To recover a machine that has been affected by this bug, please boot into recovery mode, and then from the Utilities menu open the Terminal application.
In the Terminal application, you can run the following commands:
chroot /Volumes/Macintosh\ HD # "Macintosh HD" is the default
rm -rf /Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle
mv var var_back # var may not exist, but this is fine
ln -sh private/var var
chflags -h restricted /var
chflags -h hidden /var
xattr -sw com.apple.rootless "" /var
Then reboot. This will remove the affected version of Google Software Update, then restore the damaged portion of the file system.