Merge "Use app widget host instead of holder to get rid of deleteHost" into tm-qpr-dev am: 713931ec38

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/21408002

Change-Id: I9a4ca72e07649daed35f4c4d4ca8b02caabe07bb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>