[android] Fix adb_install_apk.py's printed message.

build/android/adb_install_apk.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2012 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.
 
 """Utility script to install APKs from the command line quickly."""
 
 import multiprocessing
 import optparse
@@ skipping 27 matching lines @@
   if not options.apk:
     option_parser.error('--apk is mandatory.')
   if not os.path.exists(options.apk):
     options.apk = os.path.join(constants.DIR_SOURCE_ROOT,
                                'out', options.build_type,
                                'apks', options.apk)
 
 
 def _InstallApk(args):
   apk_path, apk_package, keep_data, device = args
-  result = android_commands.AndroidCommands(device=device).ManagedInstall(
+  android_commands.AndroidCommands(device=device).ManagedInstall(
       apk_path, keep_data, apk_package)
   print '-----  Installed on %s  -----' % device
-  print result
 
 
 def main(argv):
   parser = optparse.OptionParser()
   AddInstallAPKOption(parser)
   options, args = parser.parse_args(argv)
   ValidateInstallAPKOption(parser, options)
   if len(args) > 1:
     raise Exception('Error: Unknown argument:', args[1:])
 
   devices = android_commands.GetAttachedDevices()
   if not devices:
     raise Exception('Error: no connected devices')
 
   if not options.apk_package:
     options.apk_package = apk_helper.GetPackageName(options.apk)
 
   pool = multiprocessing.Pool(len(devices))
   # Send a tuple (apk_path, apk_package, device) per device.
   pool.map(_InstallApk, zip([options.apk] * len(devices),
                             [options.apk_package] * len(devices),
                             [options.keep_data] * len(devices),
                             devices))
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))