Revert "Use flag to control the hierarchy tree changes"

This reverts commit 34ea3dc075.

Reason for revert: Droidmonitor created revert due to b/380258772. Will be verifying through ABTD before submission.

Change-Id: Ife4707fba00b52ade53eb6dc2f4bcd7a466afe0f

src/com/android/settings/regionalpreferences/NewFirstDayOfWeekController.java

@@ -1,73 +0,0 @@
-/*
- * Copyright (C) 2024 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.settings.regionalpreferences;
-
-import android.content.Context;
-import android.provider.Settings;
-
-import androidx.annotation.NonNull;
-import androidx.core.text.util.LocalePreferences;
-
-import com.android.settings.R;
-import com.android.settings.core.BasePreferenceController;
-import com.android.settings.flags.Flags;
-
-import java.util.Locale;
-
-/** A controller for the entry of First Day of Week's page */
-public class NewFirstDayOfWeekController extends BasePreferenceController {
-
-    public NewFirstDayOfWeekController(@NonNull Context context, @NonNull String preferenceKey) {
-        super(context, preferenceKey);
-    }
-
-    /**
-     * @return {@link AvailabilityStatus} for the Setting. This status is used to determine if the
-     * Setting should be shown or disabled in Settings. Further, it can be used to produce
-     * appropriate error / warning Slice in the case of unavailability.
-     * </p>
-     * The status is used for the convenience methods: {@link #isAvailable()}, {@link
-     * #isSupported()}
-     * </p>
-     * The inherited class doesn't need to check work profile if android:forWork="true" is set in
-     * preference xml.
-     */
-    @Override
-    public int getAvailabilityStatus() {
-        if (Flags.regionalPreferencesApiEnabled()) {
-            return AVAILABLE;
-        }
-        return CONDITIONALLY_UNAVAILABLE;
-    }
-
-    @Override
-    public CharSequence getSummary() {
-        String record = Settings.System.getString(
-                mContext.getContentResolver(), Settings.System.LOCALE_PREFERENCES);
-        String result = "";
-        if (record != null) {
-            result = LocalePreferences.getFirstDayOfWeek(Locale.forLanguageTag(record), false);
-        }
-
-        if (result.isEmpty()) {
-            result = LocalePreferences.getFirstDayOfWeek(false);
-        }
-        return result.isEmpty()
-            ? mContext.getString(R.string.default_string_of_regional_preference)
-            : RegionalPreferencesDataUtils.dayConverter(mContext, result);
-    }
-}