[automerger skipped] Merge "Add PackageInstaller#uninstallExistingPackage" into rvc-dev am: f424274d am: 9e3d3a19 -s ours am: 6b3717ea -s ours
am skip reason: Change-Id I69fe4d1dd4e9da83574b431257f7be6d1ac8b2bb with SHA-1 77880fa8 is in history
Change-Id: Ia6c554b08dcc855fb4ce7f8e450af30f01b7d7c1