Google Chrome developer build (dev channel) has been updated to the version 5.0.342.1 for Windows, Mac and Linux platforms, and this updated version supports geolocation APIs.
This feature, Geolocation awareness, will allow certain "location-aware" websites to identify your location and serve content accordingly. Though, the geolocation feature will always remain optional and requires user’s confirmation before sharing geographical information of user.
Location-aware browsing feature is already available in Firefox, and soon it will be live in stable build of Google Chrome. When a user visits a location-aware website, Chrome will notify that the site wants to track user’s physical location. If user agrees to share geographical information, website will get this information using Geolocation APIs.

This is the very early implementation of geolocation in Chrome dev channel. According to Google, "Wifi based location is only supported on Windows and Mac. Permissions are not persisted (will re-prompt every time) and associated UI is incomplete." To enable geolocation in Chrome, users need to use flag –enable-geolocation.
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