make_chroot: drop support for .cros_chroot_init

Doesn't seem like a commonly used feature as it only runs once when
creating a new chroot which isn't a common flow (most people do it
once and leave it at that.  Lets drop it.  People who want to tweak
their SDK can still do so with `cros_sdk -- ...` manually.

BUG=None
TEST=CQ passes

Change-Id: I654128ef29c5801bd37e0d556e83af12faeab563
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/1966380
Reviewed-by: Alex Klein <saklein@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/sdk_lib/make_chroot.sh b/sdk_lib/make_chroot.sh
index c9370ed..4eef727 100755
--- a/sdk_lib/make_chroot.sh
+++ b/sdk_lib/make_chroot.sh
@@ -345,8 +345,7 @@
        | user_append "${FLAGS_chroot}/home/${SUDO_USER}/.bashrc"
 
    if [[ -f "${SUDO_HOME}/.cros_chroot_init" ]]; then
-     sudo -u "${SUDO_USER}" -- /bin/bash "${SUDO_HOME}/.cros_chroot_init" \
-       "${FLAGS_chroot}"
+     warn "~/.cros_chroot_init is no longer supported"
    fi
 }