Chromium Android layout test bots should be using "android" as the platform.

build/android/buildbot/bb_device_steps.py

 #!/usr/bin/env python
 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import collections
 import glob
 import multiprocessing
 import os
 import shutil
@@ skipping 195 matching lines @@
         '--clobber-old-results',
         '--exit-after-n-failures', '5000',
         '--exit-after-n-crashes-or-timeouts', '100',
         '--debug-rwt-logging',
         '--results-directory', '..layout-test-results',
         '--target', options.target,
         '--builder-name', options.build_properties.get('buildername', ''),
         '--build-number', str(options.build_properties.get('buildnumber', '')),
         '--master-name', options.build_properties.get('mastername', ''),
         '--build-name', options.build_properties.get('buildername', ''),
-        '--platform=chromium-android']
+        '--platform=android']
 
   for flag in 'test_results_server', 'driver_name', 'additional_drt_flag':
     if flag in options.factory_properties:
       cmd_args.extend(['--%s' % flag.replace('_', '-'),
                        options.factory_properties.get(flag)])
 
   for f in options.factory_properties.get('additional_expectations', []):
     cmd_args.extend(
         ['--additional-expectations=%s' % os.path.join(CHROME_SRC, *f)])
 
@@ skipping 154 matching lines @@
     return sys.exit('Unknown tests %s' % list(unknown_tests))
 
   setattr(options, 'target', options.factory_properties.get('target', 'Debug'))
 
   MainTestWrapper(options)
   provision_devices.KillHostHeartbeat()
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))