Remove unused code

* isColorTransformAccelerated() already moved to ColorDisplayManager
* TurnScreenDarker fragment already moved to top level accessibility settings or TextAndDisplay fragment

Bug: 174829936
Test: manual test
Change-Id: I34ec6947129a5042d573e94eabe3c24c2fe761b5

tests/robotests/src/com/android/settings/accessibility/TurnScreenDarkerFragmentTest.java

@@ -1,50 +0,0 @@
-/*
- * Copyright (C) 2021 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.accessibility;
-
-import static com.google.common.truth.Truth.assertThat;
-
-import android.content.Context;
-
-import androidx.test.core.app.ApplicationProvider;
-
-import com.android.settings.R;
-import com.android.settings.testutils.XmlTestUtils;
-
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.robolectric.RobolectricTestRunner;
-
-import java.util.List;
-
-/** Tests for {@link TurnScreenDarkerFragment}. */
-@RunWith(RobolectricTestRunner.class)
-public class TurnScreenDarkerFragmentTest {
-
-    private Context mContext = ApplicationProvider.getApplicationContext();
-
-    @Test
-    public void getNonIndexableKeys_existInXmlLayout() {
-        final List<String> niks = TurnScreenDarkerFragment.SEARCH_INDEX_DATA_PROVIDER
-                .getNonIndexableKeys(mContext);
-        final List<String> keys =
-                XmlTestUtils.getKeysFromPreferenceXml(mContext,
-                        R.xml.accessibility_turn_screen_darker);
-
-        assertThat(keys).containsAtLeastElementsIn(niks);
-    }
-}