Merge "Settings observer fail to unregister." am: b92cb6678c am: 6873e19485

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Settings/+/1535665

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ia3d1bb6248061f8e566d6db457ee1ad81e4be116