Refactor shortcut updating, and do it on BOOT_COMPLETE

This CL shuffles quite a bit of code around, but the effective differences are:
* Unified shortcut updating code (language switch & backup restoration).
* Shortcuts are also updated on boot (flagged by MODES_UI which will need this).
* Removed usage of (long obsolete) AsyncTask.

A further CL will add some special-casing for the DND->Modes shortcut transition.

Bug: 365545604
Test: atest com.android.settings.shortcut + manual (switch language, reboot)
Flag: android.app.modes_ui
Change-Id: I30450d13cb05008d2a71ed89d4781eb81e5532b9

src/com/android/settings/backup/SettingsBackupHelper.java

@@ -16,17 +16,19 @@
 
 package com.android.settings.backup;
 
-
 import android.app.backup.BackupAgentHelper;
+import android.util.Log;
 
 import com.android.settings.flags.Flags;
 import com.android.settings.onboarding.OnboardingFeatureProvider;
 import com.android.settings.overlay.FeatureFactory;
-import com.android.settings.shortcut.CreateShortcutPreferenceController;
+import com.android.settings.shortcut.ShortcutsUpdater;
 import com.android.settingslib.datastore.BackupRestoreStorageManager;
 
 /** Backup agent for Settings APK */
 public class SettingsBackupHelper extends BackupAgentHelper {
+    private static final String TAG = "SettingsBackupHelper";
+
     public static final String SOUND_BACKUP_HELPER = "SoundSettingsBackup";
     public static final String ACCESSIBILITY_APPEARANCE_BACKUP_HELPER =
             "AccessibilityAppearanceSettingsBackup";
@@ -58,6 +60,10 @@ public class SettingsBackupHelper extends BackupAgentHelper {
     public void onRestoreFinished() {
         super.onRestoreFinished();
         BackupRestoreStorageManager.getInstance(this).onRestoreFinished();
-        CreateShortcutPreferenceController.updateRestoredShortcuts(this);
+        try {
+            ShortcutsUpdater.updatePinnedShortcuts(this);
+        } catch (Exception e) {
+            Log.e(TAG, "Error updating shortcuts after restoring backup", e);
+        }
     }
 }