Before literally removing GRUB from your elementaryOS, consider settings its timeout to 0 (so you won't see it, but it's still there). To do it, open a terminal and run:
sudo nano /etc/default/grub
Find the lines that begin with
GRUB_HIDDEN and put a
# in front of each one. Also do it with the
GRUB_DEFAULT line. Now change the
GRUB_TIMEOUT line so it looks like
GRUB_TIMEOUT=0. Hit Ctrl+O and then ENTER to save the file and hit Ctrl+X to exit. Run:
You have been warned. Now I'll teach you how to actually remove GRUB from your partition's boot section. In a terminal, run:
sudo dd if=/dev/sdx of=/home/user/mbr.img bs=446 count=1
To make a backup of GRUB in your home folder, then
sudo dd if=/dev/zero of=/dev/sdx bs=446 count=1
To remove it.
If you want to recover GRUB, just run
sudo dd if=/home/user/mbr.img of=/dev/sdx bs=446 count=1
(!!!) Don't forget to replace
sdx with your partition name and
user with yout username!
I hope it helped!