Until now, Google Chrome's installater only targeted current user. Now, Google added a system-level setup in MSI installer, currently installs latest Dev Channel build only and seems to be targeted toward enterprise users.
"The current user-level installation experience doesn't require elevation (installing at system-level does), and most users don't know or care about system-level installs. That said, it would probably be a good idea to have some links on the download pages that say 'click here for a system-level install or MSI', so interested/advanced users could find it easily as part of the normal download install flow," explained Glenn Wilson, a Google Chrome engineer. The link to the MSI installer will probably be added to Chrome's download page in the near future.