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When Chrome is set as the default browser in Windows 8, you can pin web shortcuts (like Google Drive) to the Start screen. The icons on the tiles at the top are Metro style; the ones on the bottom are desktop style.
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.