Send ACTION_DEVICE_OWNER_CHANGED broadcast after clearing device owner

Change-Id: Iaac182c69a30e941da3a017a923247d813881521
Fix: 27261692
diff --git a/core/java/android/app/admin/DevicePolicyManager.java b/core/java/android/app/admin/DevicePolicyManager.java
index 851cf50..cfc4519 100644
--- a/core/java/android/app/admin/DevicePolicyManager.java
+++ b/core/java/android/app/admin/DevicePolicyManager.java
@@ -878,7 +878,7 @@
             = "android.app.action.DEVICE_POLICY_MANAGER_STATE_CHANGED";
 
     /**
-     * Broadcast action: sent when the device owner is set or changed.
+     * Broadcast action: sent when the device owner is set, changed or cleared.
      *
      * This broadcast is sent only to the primary user.
      * @see #ACTION_PROVISION_MANAGED_DEVICE