Merge "Remove the shadow under PendingAppWidgetHostView." into sc-dev am: 0a70a5a690 am: 036404d1fe am: ce28ceccf9

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

Change-Id: If399162451e02b01b75fd5429a89823f396d06fa