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

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



Change-Id: Iab6edd42696efa917cea20c2e5dc94ad1c4d270a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>