am 68f1dce1: (-s ours) am 3986d5e3: Update ApiLevel-18 reference images to CtsThemeHostTestCases and delete CtsHoloTestCases

* commit '68f1dce1728171f1fe3dadb673facaa11e95427d':
  Update ApiLevel-18 reference images to CtsThemeHostTestCases and delete CtsHoloTestCases