Fix build step on android bot

tools/bots/android.py

 #!/usr/bin/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.
 
 """
 Android buildbot steps.
 """
 
@@ skipping 27 matching lines @@
   pass
 
 def BuildAndroid(build_info):
   """
   Builds the android target.
 
   - build_info: the buildInfo object, containing information about what sort of
       build and test to be run.
   """
   with bot.BuildStep('Build Android'):
-    targets = ['dart']
+    targets = ['android_embedder']
     args = [sys.executable, './tools/build.py', '--mode=' + build_info.mode,
-        '--os=android ' + ' '.join(targets)]
+            '--os=android'] + targets
     print 'Building Android: %s' % (' '.join(args))
     bot.RunProcess(args)
 
 if __name__ == '__main__':
   bot.RunBot(AndroidConfig, AndroidSteps, build_step=BuildAndroid)