Merge "Remove some functions @hide in WindowContainerTransaction" into tm-dev am: 34e18413

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17741151



Change-Id: I928c409118fede150765f70f3e8dd8033d1f1454
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>