Chrome Book Acer C7 dual boot support

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http://ubuntuforums.org – Bought a Chromebook Acer C7 back in December of 2012. Dual-booted the Chrome OS with the first version of Chrubuntu: http://chromeos-cr48.blogspot.com/ It was a pain to install, but the results were incredible....until during a routine update I accidentally gave Ubuntu permission to upgrade. Completely screwed up the boot process for Ubuntu and left me with only the Chrome OS operating. Now the tricky part: During the Chrubuntu installation, I dedicated 315 gbs (out of 320) to the Ubuntu partition. Now the Chrome OS is booting and operating with the 5 gbs I left over. How can I wipe these pa (Hardware)