Merge "Removed unwanted shadow in restart and letterbox education dialogs"...

Merge "Removed unwanted shadow in restart and letterbox education dialogs" into tm-qpr-dev am: e20f8164 am: a1e7c32e am: 89c1efe4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21408602



Change-Id: Icfb7335ce27eab9e1c85c2f1420c289642a6845f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>