Switch from core to core-libart
Switch from core to core-libart

Bug: 14298175
Change-Id: I5e491bbebeffda594f233b0c21b8096070ca0f3c

xin3liang/platform_external_mockwebserver,Omegaphora/external_mockwebserver,geekboxzone/lollipop_external_mockwebserver,android-ia/platform_external_mockwebserver,geekboxzone/mmallow_external_mockwebserver