Bumping AOSP Contacts version to 1.4.15 am: d2ac793647  -s ours am: 0b69d7cdf4
am: cfb1ec7ec3

* commit 'cfb1ec7ec3082220ab14fcd9577fe781135291b2':
  Bumping AOSP Contacts version to 1.4.15

Change-Id: I637747fdf1ca93aa0ba0ba101ebc5abcac8716f2