Merge "Destroy activity/view references to avoid memory leak" into sc-v2-dev am: 683b4cd824 am: f1c38718d5

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/16365768

Change-Id: I0144c29e4ca9e0ea04d831f4473b4fd6ccf21a8f