Revert "Setting to change sysui theme"

This reverts commit 74fde3ea31.

Reason for revert: CL was intended to be a workaround while we were still working on global theming.

Change-Id: I2c10971b9eab5382c1782c8d09c569edc35ea191

src/com/android/settings/display/SystemUiThemePreferenceController.java

@@ -1,72 +0,0 @@
-/*
- * Copyright (C) 2018 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.display;
-
-import static android.provider.Settings.Secure.THEME_MODE;
-
-import android.content.Context;
-import android.provider.Settings;
-import android.util.FeatureFlagUtils;
-
-import com.android.settings.core.BasePreferenceController;
-
-import androidx.preference.ListPreference;
-import androidx.preference.Preference;
-import androidx.preference.PreferenceScreen;
-
-/**
- * Setting where user can pick if SystemUI will be light, dark or try to match
- * the wallpaper colors.
- */
-public class SystemUiThemePreferenceController extends BasePreferenceController
-        implements Preference.OnPreferenceChangeListener {
-
-    private ListPreference mSystemUiThemePref;
-
-    public SystemUiThemePreferenceController(Context context, String preferenceKey) {
-        super(context, preferenceKey);
-    }
-
-    @Override
-    public int getAvailabilityStatus() {
-        boolean enabled = FeatureFlagUtils.isEnabled(mContext, "settings_systemui_theme");
-        return enabled ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
-    }
-
-    @Override
-    public void displayPreference(PreferenceScreen screen) {
-        super.displayPreference(screen);
-        mSystemUiThemePref = (ListPreference) screen.findPreference(getPreferenceKey());
-        int value = Settings.Secure.getInt(mContext.getContentResolver(), THEME_MODE, 0);
-        mSystemUiThemePref.setValue(Integer.toString(value));
-    }
-
-    @Override
-    public boolean onPreferenceChange(Preference preference, Object newValue) {
-        int value = Integer.parseInt((String) newValue);
-        Settings.Secure.putInt(mContext.getContentResolver(), THEME_MODE, value);
-        refreshSummary(preference);
-        return true;
-    }
-
-    @Override
-    public CharSequence getSummary() {
-        int value = Settings.Secure.getInt(mContext.getContentResolver(), THEME_MODE, 0);
-        int index = mSystemUiThemePref.findIndexOfValue(Integer.toString(value));
-        return mSystemUiThemePref.getEntries()[index];
-    }
-}