Fix bug in dart_sdk annotated.

tools/bots/dart_sdk.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2015, 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 os.path
 import shutil
 import sys
 
@@ skipping 89 matching lines @@
            % apidocs_destination_gcsdir)
     return
 
   # Upload everything inside the built apidocs directory.
   gsutil = bot_utils.GSUtil()
   gsutil.upload(dir_name, apidocs_destination_gcsdir, recursive=True,
                 public=True)
 
   # Update latest.txt to contain the newest revision.
   with utils.TempDir('latest_file') as temp_dir:
-    latest_file = join(temp_dir, 'latest.txt')
+    latest_file = os.path.join(temp_dir, 'latest.txt')
     with open(latest_file, 'w') as f:
       f.write('%s' % revision)
     DartArchiveFile(latest_file, apidocs_destination_latestfile)
 
 def GsutilExists(gsu_path):
   # This is a little hackish, but it is basically a one off doing very
   # specialized check that we don't use elsewhere.
   gsutilTool = os.path.join(bot_utils.DART_DIR,
                             'third_party', 'gsutil', 'gsutil')
   (_, stderr, returncode) = bot_utils.run(
@@ skipping 47 matching lines @@
     gsutil.upload(local_sha256, remote_path + '.sha256sum', public=True)
 
 def Run(command):
   print "Running %s" % ' '.join(command)
   return bot.RunProcess(command)
 
 if __name__ == '__main__':
   CreateUploadSDK()
   if BUILD_OS == 'linux':
     CreateUploadAPIDocs()