Chromium Team is still working on integrating Google Now into the browser. Last change is about adding a user preference to allow Google Services to use the user's location
If you want to see this checkbox, here's what you have to do:
- Open Google Chrome Canary,
- Enable chrome://flags/#enable-google-now
- Go to chrome://settings/content
- Scroll to "Location" section and toggle it.
For now, Google Now is still not operational though.