drop some deprecated wrappers

BUG=None
TEST=None

Change-Id: If19b6ac09e5bcb70c1f8f781e4ddcea87f72411b
Reviewed-on: https://chromium-review.googlesource.com/701676
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
diff --git a/cros_run_unit_tests b/cros_run_unit_tests
deleted file mode 120000
index d0fa7d2..0000000
--- a/cros_run_unit_tests
+++ /dev/null
@@ -1 +0,0 @@
-../platform/crostestutils/cros_run_unit_tests
\ No newline at end of file
diff --git a/cros_workon b/cros_workon
deleted file mode 100755
index d8aafa0..0000000
--- a/cros_workon
+++ /dev/null
@@ -1,15 +0,0 @@
-#!/bin/bash
-
-# Copyright (c) 2011 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.
-
-# TODO(wiley) Remove this on July 20 2015.
-echo 'Did you mean to run `cros_workon` (note, no ./)?'
-echo ''
-echo 'The logic in this script has moved.'
-echo 'If simply running `cros_workon` does not work, sync your SDK and run:'
-echo ''
-echo '    /mnt/host/source/src/scripts/update_chroot; hash -r'
-echo ''
-exit 1
diff --git a/image_to_usb.sh b/image_to_usb.sh
deleted file mode 100755
index a859463..0000000
--- a/image_to_usb.sh
+++ /dev/null
@@ -1,15 +0,0 @@
-#!/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_ROOT=$(dirname $(readlink -f "$0"))
-. "${SCRIPT_ROOT}/common.sh" || exit 1
-
-error "image_to_usb.sh is deprecated! Use 'cros flash' instead."
-error "See 'cros flash -h' for the usage."
-error "More information is available at:"
-error "http://www.chromium.org/chromium-os/build/cros-flash"
-
-exit 1
diff --git a/make_factory_toolkit.sh b/make_factory_toolkit.sh
deleted file mode 100755
index df027c8..0000000
--- a/make_factory_toolkit.sh
+++ /dev/null
@@ -1,10 +0,0 @@
-#!/bin/bash
-# Copyright (c) 2014 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.
-
-echo 'This script is deprecated and will be removed soon.'
-echo 'To get toolkit, run "emerge-$BOARD chromeos-factory"'
-echo ' or "cd ../platform/factory; make toolkit BOARD=$BOARD".'
-echo 'Read go/cros-factory-make for more details.'
-