Fix some issues with buildbot recipe change.

tools/bots/bot_utils.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 import hashlib
 import imp
 import os
 import platform
@@ skipping 127 matching lines @@
 
   def dartium_directory(self, revision):
     return self._variant_directory('dartium', revision)
 
   def dartium_android_directory(self, revision):
     return self._variant_directory('dartium_android', revision)
 
   def sdk_directory(self, revision):
     return self._variant_directory('sdk', revision)
 
-  def linux_packages_directory(self, revision, linux_system):
-    return '/'.join([self._variant_directory('linux_packages', revision),
-                     linux_system])
+  def linux_packages_directory(self, revision):
+    return '/'.join([self._variant_directory('linux_packages', revision)])
 
   def src_directory(self, revision):
     return self._variant_directory('src', revision)
 
   def editor_directory(self, revision):
     return self._variant_directory('editor', revision)
 
   def editor_eclipse_update_directory(self, revision):
     return self._variant_directory('editor-eclipse-update', revision)
 
@@ skipping 209 matching lines @@
   print "SHA256 checksum of %s is %s" % (filename, checksum)
   return checksum_filename
 
 def GetChannelFromName(name):
   """Get the channel from the name. Bleeding edge builders don't
       have a suffix."""
   channel_name = string.split(name, '-').pop()
   if channel_name in Channel.ALL_CHANNELS:
     return channel_name
   return Channel.BLEEDING_EDGE