Google Chrome automatically checks for software updates in the background. If you want to disable the automatic updates to reduce data traffic, you can do this with a defaults write command.
defaults write com.google.Keystone.Agent checkInterval 0
Restart Google Chrome to make changes affect.
You can manually check for software update by executing ‘CheckForUpdatesNow.command’ in the folder:
/Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents/Resources/
Restore to the default setting with:
defaults write com.google.Keystone.Agent checkInterval 18000
Thanks!