Allow users to choose a notification assistant.

Change-Id: Iddfbfedbb6a3aae246058ff41324dc06852484cb
diff --git a/src/com/android/settings/SettingsActivity.java b/src/com/android/settings/SettingsActivity.java
index 94379b3..4d9e2f0 100644
--- a/src/com/android/settings/SettingsActivity.java
+++ b/src/com/android/settings/SettingsActivity.java
@@ -61,6 +61,7 @@
 import com.android.settings.applications.InstalledAppDetails;
 import com.android.settings.applications.ManageApplications;
 import com.android.settings.applications.ManageAssist;
+import com.android.settings.applications.ManageDefaultApps;
 import com.android.settings.applications.ProcessStatsSummary;
 import com.android.settings.applications.ProcessStatsUi;
 import com.android.settings.applications.UsageAccessDetails;
@@ -306,6 +307,7 @@
             ProcessStatsSummary.class.getName(),
             DrawOverlayDetails.class.getName(),
             WriteSettingsDetails.class.getName(),
+            ManageDefaultApps.class.getName(),
     };