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This instance of Chrome is running on the Windows 8 desktop (the taskbar at the bottom is the biggest clue). An option on the Chrome menu, available in Chrome version 23, allows you to switch into Windows 8 (aka Metro) mode with a single click.
In Windows 8 mode, note that the browser occupies the entire screen and can't be resized (except to snap it alongside one other Windows 8 app). The tabs look the same as in the desktop version, and you can switch back with an option on the Chrome menu.
When you're running in Windows 8 mode, you can pin a shortcut to the Start screen using this option.