Revert API breaking change in  System API.

Change introduced in ag/616521

Change-Id: Ia95982b051496e123b4a179746aea15c6a0b8a65
diff --git a/location/java/android/location/GpsNavigationMessageEvent.java b/location/java/android/location/GpsNavigationMessageEvent.java
index 7452721..bd6921c 100644
--- a/location/java/android/location/GpsNavigationMessageEvent.java
+++ b/location/java/android/location/GpsNavigationMessageEvent.java
@@ -36,18 +36,18 @@
      * The system does not support tracking of GPS Navigation Messages. This status will not change
      * in the future.
      */
-    public static final int STATUS_NOT_SUPPORTED = 0;
+    public static int STATUS_NOT_SUPPORTED = 0;
 
     /**
      * GPS Navigation Messages are successfully being tracked, it will receive updates once they are
      * available.
      */
-    public static final int STATUS_READY = 1;
+    public static int STATUS_READY = 1;
 
     /**
      * GPS provider or Location is disabled, updated will not be received until they are enabled.
      */
-    public static final int STATUS_GPS_LOCATION_DISABLED = 2;
+    public static int STATUS_GPS_LOCATION_DISABLED = 2;
 
     private final GpsNavigationMessage mNavigationMessage;