Merge "Remove overrideIconTintForNavMode for Taskbar Nav buttons" into udc-dev am: 3d2a6f1e am: ea7fe691 am: 0ff2fd68 am: 2dd1b9bf

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23696663



Change-Id: Ic0c148c798e77ef81af08924ac8204a33429b3a2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>