Merge "Removes old/unused left/right button logic from bottom area." into tm-qpr-dev am: 4c5423146c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19119857

Change-Id: Ia20d72cb61311baf21b4c8fcdb97bc9620f73859
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>