Merge "[automerger skipped] Merge "Add PackageInstaller#uninstallExistingPackage" into rvc-dev am: f424274d am: 9e3d3a19 am: 6b043a3c -s ours" into rvc-qpr-dev-plus-aosp am: ef6a6b2d -s ours

am skip reason: Change-Id I69fe4d1dd4e9da83574b431257f7be6d1ac8b2bb with SHA-1 77880fa8 is in history

Change-Id: I0060fcf924c4f0d1c8c30fc5fa7a584cae106672