Allow users to choose a notification assistant.

Change-Id: Iddfbfedbb6a3aae246058ff41324dc06852484cb
diff --git a/src/com/android/settings/Settings.java b/src/com/android/settings/Settings.java
index 149ef45..edd0b4c 100644
--- a/src/com/android/settings/Settings.java
+++ b/src/com/android/settings/Settings.java
@@ -121,6 +121,7 @@
     public static class WriteSettingsActivity extends SettingsActivity { /* empty */ }
     public static class AppDrawOverlaySettingsActivity extends SettingsActivity { /* empty */ }
     public static class AppWriteSettingsActivity extends SettingsActivity { /* empty */ }
+    public static class ManageDefaultAppsActivity extends SettingsActivity { /* empty */ }
 
     // Categories.
     public static class WirelessSettings extends SettingsActivity { /* empty */ }