Merge "Removing RWC#getValidLaunchRootTaskInTaskDisplayArea" into tm-dev am: 8c735f9b am: 64a1d37a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16938648

Change-Id: Ie85a27afcce0848e479a5d00c743f76216487332