Merge "Do not register OnBackInvokedCallback for SoftInputWindow." into udc-qpr-dev am: 716fdd09

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24415796



Change-Id: I160ce33226993c4bc827d0d75a1810c8a8bf4b54
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>