Bumping AOSP Contacts version to 1.4.15
am: d2ac793647

* commit 'd2ac79364766e892102330bbbf0323f4439db3f6':
  Bumping AOSP Contacts version to 1.4.15

Change-Id: Icdf2fe63b6a0c49cde0c3b33ba92cb7b8ce1e95d