Prevent cursor from causing global reference leaks.

To fix this the ContentQueryMap needs to be closed
when onStop is called so any global references can
be reclaimed.

Change-Id: I0c679c10b0d75ab0aac2fe499563c57d934e318a

src/com/android/settings/LocationSettings.java

@@ -76,6 +76,7 @@ public class LocationSettings extends SettingsPreferenceFragment
         if (mSettingsObserver != null) {
             mContentQueryMap.deleteObserver(mSettingsObserver);
         }
+        mContentQueryMap.close();
     }
 
     private PreferenceScreen createPreferenceHierarchy() {