make_chroot: drop build-docbook-catalog hack

Now that the newer build-docbook-catalog supports ROOT, we don't need
to manually run this ourselves.

BUG=chromium-os:18036
TEST=`cbuildbot chromiumos-sdk` works

Change-Id: I3a89701a49623f9e50e651af9d8d505608fdc615
Reviewed-on: https://gerrit.chromium.org/gerrit/19252
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Zdenek Behan <zbehan@chromium.org>
Commit-Ready: Mike Frysinger <vapier@chromium.org>
diff --git a/sdk_lib/make_chroot.sh b/sdk_lib/make_chroot.sh
index 4b80468..0a5d098 100755
--- a/sdk_lib/make_chroot.sh
+++ b/sdk_lib/make_chroot.sh
@@ -229,16 +229,9 @@
 EOF
 
    # TODO(zbehan): Configure stuff that is usually configured in postinst's,
-   # but wasn't. Fix the postinst's. crosbug.com/18036
+   # but wasn't. Fix the postinst's.
    info "Running post-inst configuration hacks"
    early_enter_chroot env-update
-   if [ -f ${FLAGS_chroot}/usr/bin/build-docbook-catalog ]; then
-     # For too ancient chroots that didn't have build-docbook-catalog, this
-     # is not relevant, and will get installed during update.
-     early_enter_chroot build-docbook-catalog
-     # Configure basic stuff needed.
-     early_enter_chroot env-update
-   fi
 
    # This is basically a sanity check of our chroot.  If any of these
    # don't exist, then either bind mounts have failed, an invocation