am 76ae12a5: am 405da17e: am e0c6f48d: Merge "Revert "customtabs: Add "extraCommand" and "extraCallback", for unsupported commands"" into mnc-dev

* commit '76ae12a5484625519b279d9b386b5aa7b6762661':
  Revert "customtabs: Add "extraCommand" and "extraCallback", for unsupported commands"