Everyone's favorite Google evangelist, François Beaufort, has discovered a Chromium code review that aims to add Google Wallet to Chrome. The review in question is titled "Make sure the Google wallet in-app payment support app is always installed" and does basically what it says: integrates Google Wallet into Chrome.
Google Wallet has actually already been integrated into the latest Chrome Canary build, which you can verify by trying to download and install the latest build of the app. Integrating Wallet into Chrome is a natural extension as Google continues to push the web through Chrome OS as alternative operating systems.
We can expect to see Google Wallet show up in the everyday build of Chrome in a few months, likely when Chrome 29 launches.