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The new command is now the following:

sudo /Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents/Resources/GoogleSoftwareUpdateAgent.app/Contents/Resources/install.py --nuke

This was an older command:

sudo ~/Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents/Resour‌​ces/GoogleSoftwareUpdateAgent.app/Contents/Resources/ksinstall --uninstall

In the older command above, you may prefer to replace the --uninstall with the --nuke option. The former supposedly leaves some files, while the latter removes them.

Alternatively, Google Software Update might be installed within /Library/, in which case it can be removed with:

sudo /Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents/Resources/GoogleSoftwareUpdateAgent.app/Contents/Resources/ksinstall --uninstall

On their official help page, they only mention disabling the checks:

To disable Google Software Update from checking for updates, execute
the following in the Terminal application:

$ defaults write com.google.Keystone.Agent checkInterval 0

In my Mac OS X 10.9.5 ksinstall resides in the main library. The commend is thus:

sudo /Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents/Resources/ksinstall --nuke

Success on a Mac Sept 29, 2017:

The "official" Google-given method given to stop the Google Software Update is this, but it doesn't always work. The updater sometimes, on some systems, finds a way to reset itself and update anyway.
In Terminal: defaults write com.google.Keystone.Agent checkInterval 0

The most foolproof method is to deny Chrome the permissions it needs to install the update software and run it. Empty these directories:
/Library/Google/GoogleSoftwareUpdate/
~/Library/Google/GoogleSoftwareUpdate/

Then change the permissions on both folders named GoogleSoftwareUpdate so that there's no owner and no read/write/execute permissions.

In terminal:

cd /Library/Google/

sudo chown nobody:nogroup GoogleSoftwareUpdate

sudo chmod 000 GoogleSoftwareUpdate

cd ~/Library/Google/

sudo chown nobody:nogroup GoogleSoftwareUpdate

sudo chmod 000 GoogleSoftwareUpdate

If you want to be double-certain, then do the same for the folder Google one level up.

cd /Library/

sudo chown nobody:nogroup Google

sudo chmod 000 Google

cd ~/Library/

sudo chown nobody:nogroup Google

sudo chmod 000 Google

I did this immediately after installing the Chrome version I need for my machine, and it worked perfectly. Now when I check About Google Chrome it gives me the error "Update failed (error: 10)" It's still trying to update, but it can't do it any more.

Use --help to see the various ksinstall options, i.e. ksinstall --help

cd ~/Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents/Resour‌​ces/GoogleSoftwareUpdateAgent.app/Contents/Resources/



ksinstall --help



[--install=PKG]     Install keystone using PKG as the source.

[--uninstall]       Remove Keystone program files but do NOT delete

                    the ticket store.

[--nuke]            Remove Keystone and all tickets.

[--interval=N]      Set installed agent to wake up every N seconds.

[--lockdown]        Prevent Keystone from ever uninstalling itself.

[--force]           Perform operation even if it is a downgrade.