It was the Google+ user François Beaufort who found out that Google Now may be coming to the Google Chrome browser, after finding references in the latest build version of Chromium (which Chrome is based on).
As a note in the Chromium Code Reviews the following can be read:
Creating a skeleton for Google Now for Chrome implementation. The CL creates the top-level structure for showing Google Now cards in Chrome via Chrome Notifications. The implementation lives behind -enable-google-now-integration flag.
Google has confirmed to CNET that they are working on the project but has not confirmed any further details.
“We’re always experimenting with new features in Chrome, so have nothing to announce at this time,” spokeswoman Jessica Kositz said.