Remove obsolete channel_change and mkcrosusb commands.

channel_change

Index: channel_change
diff --git a/channel_change b/channel_change
deleted file mode 100755
index d4c405aa4867cc54d93e14649099735fab3b3b9d..0000000000000000000000000000000000000000
--- a/channel_change
+++ /dev/null
@@ -1,27 +0,0 @@
-#!/bin/sh
-#
-# 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 change the channel between dev and beta.
-###############################################################################
-# Syntax:
-# channel_change $1 where $1 is --beta or --dev
-# e.g. to change the channel to beta-channel
-# change_channel --beta
-###############################################################################
-# MAIN
-###############################################################################
-echo
-echo "Currently, changing channels requires the use of a recovery device for"
-echo "the desired channel.  An image may be downloaded, or you may use a"
-echo "pre-configured USB recovery device."
-echo
-echo "A new recovery device may be created at chrome://imageburner"
-echo
-echo "To enter recovery mode, power down your computer and restart it with the "
-echo "recovery button depressed.  For older devices, use the BIOS boot menu "
-echo "to select the USB recovery device."
-echo
-exit 1