Let Messaging dex depend on proguard flag file am: aa7dc68 am: 6cedb61
am: 1c21572

* commit '1c21572b50eb3b242952cde452e59b1b941f28fb':
  Let Messaging dex depend on proguard flag file

Change-Id: I61dd43a40bf122a40652f02ff4f753066188f190