crosutils: Require cros_show_stacks to run inside chroot

cros_show_stacks

 #!/bin/bash
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Script to generate stackdumps from a machine or dmp files.
 
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
 
 . "$(dirname $0)/common.sh"
 . "$(dirname $0)/remote_access.sh"
 
-restart_in_chroot_if_needed $*
+assert_inside_chroot
 
 MINIDUMP_DUMP=/usr/bin/minidump_dump
 MINIDUMP_STACKWALK=/usr/bin/minidump_stackwalk
 USING_REMOTE=0
 
 get_default_board
 
 DEFINE_string board "${DEFAULT_BOARD}" \
     "The board for which you are building autotest"
 DEFINE_string breakpad_root "" \
@@ skipping 136 matching lines @@
       ${MINIDUMP_STACKWALK} "${dump}" "${FLAGS_breakpad_root}" 2> /dev/null
     else
       info "Dumping kcrash $(basename ${dump}):"
       cat "${dump}"
     fi
     echo ""
   done
 }
 
 main "$@"