Revert "Add settings for scheduling dark theme"

This reverts commit 7141b142df.

Reason for revert: This is breaking builds on git_qt-qpr1-dev

Change-Id: I7766826d3fc86a12fc8411b027a52eceb5a66019

src/com/android/settings/display/darkmode/DarkModeObserver.java

@@ -1,80 +0,0 @@
-/*
- * Copyright (C) 2019 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.darkmode;
-
-import android.content.Context;
-import android.database.ContentObserver;
-import android.net.Uri;
-import android.os.Handler;
-import android.os.Looper;
-import android.provider.Settings;
-import com.android.internal.annotations.VisibleForTesting;
-
-/**
- * Observes changes for dark night settings*/
-public class DarkModeObserver {
-    private ContentObserver mContentObserver;
-    private Runnable mCallback;
-    private Context mContext;
-
-    public DarkModeObserver(Context context) {
-        mContext = context;
-        mContentObserver = new ContentObserver(new Handler(Looper.getMainLooper())) {
-            @Override
-            public void onChange(boolean selfChange, Uri uri) {
-                super.onChange(selfChange, uri);
-                final String setting = uri == null ? null : uri.getLastPathSegment();
-                if (setting != null && mCallback != null) {
-                    switch (setting) {
-                        case Settings.Secure.UI_NIGHT_MODE:
-                            mCallback.run();
-                            break;
-                        default:
-                    }
-                }
-            }
-        };
-    }
-
-    /**
-     * subscribe callback when night mode changed in the database
-     *
-     * @param callback the callback that gets triggered when subscribed
-     */
-    public void subscribe(Runnable callback) {
-        callback.run();
-        mCallback = callback;
-        final Uri uri = Settings.Secure.getUriFor(Settings.Secure.UI_NIGHT_MODE);
-        mContext.getContentResolver().registerContentObserver(uri, false, mContentObserver);
-    }
-
-    /**
-     * unsubscribe from dark ui database changes
-     */
-    public void unsubscribe() {
-        mContext.getContentResolver().unregisterContentObserver(mContentObserver);
-        mCallback = null;
-    }
-
-    @VisibleForTesting
-    protected void setContentObserver(ContentObserver co) {
-        mContentObserver = co;
-    }
-
-    @VisibleForTesting
-    protected ContentObserver getContentObserver() {
-        return mContentObserver;
-    }
-}