The only option to install Google Chrome that is provided on the official website of the Google browser is an online installer that will perform the installation right after clicking on the install link. Some users and administrators might need a different solution. This can be because of firewall or network rules, distribution on computer systems that are not connected to the Internet or to save bandwidth by using the same installer on multiple computer systems.
There are probably additional reasons for a Google Chrome offline installer. There is however an easy - but somewhat hidden - option for users who want to download an offline installer for Google Chrome.
All that these users need to do is to append the parameter standalone=1 to the website where Google Chrome can be downloaded. Here are the two download links for the latest official and latest beta version of the Google browser:
Latest official: http://www.google.com/chrome/eula.html?standalone=1
Latest beta: http://www.google.com/chrome/eula.html?extra=betachannel&standalone=1
This will download the full installer of the selected Google Chrome browser to the local computer system. It is then possible to install Google Chrome without Internet connection by simply distributing the offline installer to the computer system where it should be installed.
The Google Chrome developers mentioned that it might not be possible to auto-update these versions of the Google Chrome browser. The auto update service should however be active when downloading the offline installers. They should work normally if an Internet connection is present to check for updates.
Update: Here is the standalone installer link for the Google Chrome Dev channel
Latest Dev Build: https://www.google.com/chrome/eula.html?extra=devchannel&platform=win&standalone=1
Google Chrome Canary seems to be the only version of the browser where the standalone parameter is not working. It is not clear at this point if there is another parameter that needs to be passed to download a standalone version of the Canary channel build.