[automerger skipped] Merge "Add PackageInstaller#uninstallExistingPackage" into rvc-dev am: f424274d am: 9e3d3a19 am: 6b043a3c -s ours
am skip reason: Change-Id I69fe4d1dd4e9da83574b431257f7be6d1ac8b2bb with SHA-1 77880fa8 is in history
Change-Id: Ifd717e132edf649ccb72eec2f1bdf408629a16a1