Unfortunately you can’t. The only way to delete a directory from a Android device connected with adb is to execute: adb shell rm -r /path/to/dir and only if you have permissions, ie you have a rooted device or you are working with Android’s emulator.
We had to respond: Check out this cool app on Android Market! Nokia WP7 Emulator for Android #Nokia #WP7 #Emulator for #Android Facebook page: http://www.facebook.com/pages/Say-No-to-Nokia-windows-phone/153995821320420