Merge "Remove the shadow under PendingAppWidgetHostView." into sc-dev am: 0a70a5a690 am: f681c88cbe am: e6f4806d36

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15328564

Change-Id: I2aec4b53e3bf3dbf49d0ad6dfd34b5bd66d92ddf