Removing partitions from Chromebook (Chrome Recovery Utility not working)

I dual installed GalliumOS and ChromeOS on my Lenovo 100S ChromeBook.

I tried to uninstall GalliumOS but didn't manage to delete its partitions.

Now I have ChromeOS installed, but it has under 1 GB of free space because most of the Hard Drive space is taken up by these unneeded partitions.

I've tried to use the Chrome Recovery Utility to install a recovery program to an SD card and to a USB stick.

Running the recovery utility on Chrome shows an error because there is not 4GB space on the computer to download the recovery program

I tried running it on Windows as well but it also failed to install to the USB. I formatted the USB to whatever Windows wanted prior to trying to install the recovery program. The error is non-specific, it just says "utility error" or something.

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