Remove the ProximityAlerts update Receiver when the last ProximityAlert expires.

Fixes issue 6900.

Change-Id: Ifcd3fa9c34cfca02ed5e7a94aded33984ac81c60
Signed-off-by: Mike Lockwood <lockwood@android.com>

services/java/com/android/server/LocationManagerService.java

@@ -1205,8 +1205,9 @@ public class LocationManagerService extends ILocationManager.Stub implements Run
             // Remove expired alerts
             if (intentsToRemove != null) {
                 for (PendingIntent i : intentsToRemove) {
-                    ProximityAlert alert = mProximityAlerts.remove(i);
+                    ProximityAlert alert = mProximityAlerts.get(i);
                     mProximitiesEntered.remove(alert);
+                    removeProximityAlertLocked(i);
                 }
             }
         }