am 7c600369: Merge "Update Context.getSystemService() docs for download manager." into gingerbread

Merge commit '7c600369c9695de73ca37db552eb81b8b89d5e76' into gingerbread-plus-aosp

* commit '7c600369c9695de73ca37db552eb81b8b89d5e76':
  Update Context.getSystemService() docs for download manager.