image_to_vm.sh: delete unused import

It looks like all users of this were removed in previous commits.

BUG=chromium:1145812
TEST=CQ passes

Change-Id: I038fde27ea6fe525dde0d36e249a72b9bf0ac8a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2648860
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Shao-Chuan Lee <shaochuan@chromium.org>
diff --git a/image_to_vm.sh b/image_to_vm.sh
index 2f033ca..0d6a630 100755
--- a/image_to_vm.sh
+++ b/image_to_vm.sh
@@ -15,9 +15,6 @@
 # Need to be inside the chroot to load chromeos-common.sh
 assert_inside_chroot
 
-# Load functions and constants for chromeos-install
-. /usr/share/misc/chromeos-common.sh || exit 1
-
 # Default values for creating VM's.
 DEFAULT_QEMU_IMAGE="chromiumos_qemu_image.bin"