am 4dd082bf: Disable dialpad chooser when the user selects "Add call".

Merge commit '4dd082bff5d9f2d056affbfa0858f04dac38598e' into gingerbread-plus-aosp

* commit '4dd082bff5d9f2d056affbfa0858f04dac38598e':
  Disable dialpad chooser when the user selects "Add call".