How to remove dock shelf from Mavericks?
They removed this feature from 10.9. No one really knows why, but it is removed from the dock settings UI as well as the command line. From the linked article;


  As of Mountian Lion, the Dock is rendered by the OS, instead of the OS using a set of image files like in Lion and before, so it can't be edited.
  
  The 2D dock terminal trick only worked via a string item in the Dock executable. As of Mavericks, that string item has been removed.
  
  The only way to edit the dock would be to patch the encrypted Dock executable, and inject software to re-render the Dock differently in memory. Not a simple task.