image_to_vm.sh: delete unused options

These flags haven't been checked in years in this script.  Delete them.

BUG=chromium:1145812
TEST=CQ passes

Change-Id: I8c5ab7e756d6c281296694305b288069e817e748
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2648859
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Shao-Chuan Lee <shaochuan@chromium.org>
Reviewed-by: Stimim Chen <stimim@chromium.org>
diff --git a/image_to_vm.sh b/image_to_vm.sh
index 3b9a2c9..2f033ca 100755
--- a/image_to_vm.sh
+++ b/image_to_vm.sh
@@ -26,13 +26,6 @@
   "Adjustments to apply to the partition table"
 DEFINE_string board "${DEFAULT_BOARD}" \
   "Board for which the image was built"
-DEFINE_boolean factory $FLAGS_FALSE \
-    "Modify the image for manufacturing testing"
-DEFINE_boolean factory_install $FLAGS_FALSE \
-    "Modify the image for factory install shim"
-
-# We default to TRUE so the buildbot gets its image.
-DEFINE_boolean force_copy ${FLAGS_FALSE} "Always rebuild test image"
 DEFINE_string from "" \
   "Directory containing rootfs.image and mbr.image"
 DEFINE_string disk_layout "2gb-rootfs-updatable" \