Delete "background process limit" debug option

We're deprecating max limits for cached/empty app processes.

Bug: 253908413
Change-Id: Iff80f173e72e9b77faefe3c66543c0756f2e6f74
Flag: EXEMPT cleaning up now-unused flag

src/com/android/settings/development/BackgroundProcessLimitPreferenceController.java

@@ -1,104 +0,0 @@
-/*
- * Copyright (C) 2017 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.development;
-
-import android.app.ActivityManager;
-import android.app.IActivityManager;
-import android.content.Context;
-import android.os.RemoteException;
-
-import androidx.annotation.VisibleForTesting;
-import androidx.preference.ListPreference;
-import androidx.preference.Preference;
-
-import com.android.settings.core.PreferenceControllerMixin;
-import com.android.settingslib.R;
-import com.android.settingslib.development.DeveloperOptionsPreferenceController;
-
-public class BackgroundProcessLimitPreferenceController extends
-        DeveloperOptionsPreferenceController implements Preference.OnPreferenceChangeListener,
-        PreferenceControllerMixin {
-
-    private static final String APP_PROCESS_LIMIT_KEY = "app_process_limit";
-
-    private final String[] mListValues;
-    private final String[] mListSummaries;
-
-    public BackgroundProcessLimitPreferenceController(Context context) {
-        super(context);
-
-        mListValues = context.getResources().getStringArray(R.array.app_process_limit_values);
-        mListSummaries = context.getResources().getStringArray(R.array.app_process_limit_entries);
-    }
-
-    @Override
-    public String getPreferenceKey() {
-        return APP_PROCESS_LIMIT_KEY;
-    }
-
-    @Override
-    public boolean onPreferenceChange(Preference preference, Object newValue) {
-        writeAppProcessLimitOptions(newValue);
-        updateAppProcessLimitOptions();
-        return true;
-    }
-
-    @Override
-    public void updateState(Preference preference) {
-        updateAppProcessLimitOptions();
-    }
-
-    @Override
-    protected void onDeveloperOptionsSwitchDisabled() {
-        super.onDeveloperOptionsSwitchDisabled();
-        writeAppProcessLimitOptions(null);
-    }
-
-    private void updateAppProcessLimitOptions() {
-        try {
-            final int limit = getActivityManagerService().getProcessLimit();
-            int index = 0; // default
-            for (int i = 0; i < mListValues.length; i++) {
-                int val = Integer.parseInt(mListValues[i]);
-                if (val >= limit) {
-                    index = i;
-                    break;
-                }
-            }
-            final ListPreference listPreference = (ListPreference) mPreference;
-            listPreference.setValue(mListValues[index]);
-            listPreference.setSummary(mListSummaries[index]);
-        } catch (RemoteException e) {
-            // intentional no-op
-        }
-    }
-
-    private void writeAppProcessLimitOptions(Object newValue) {
-        try {
-            final int limit = newValue != null ? Integer.parseInt(newValue.toString()) : -1;
-            getActivityManagerService().setProcessLimit(limit);
-            updateAppProcessLimitOptions();
-        } catch (RemoteException e) {
-            // intentional no-op
-        }
-    }
-
-    @VisibleForTesting
-    IActivityManager getActivityManagerService() {
-        return ActivityManager.getService();
-    }
-}

src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java

@@ -740,7 +740,6 @@ public class DevelopmentSettingsDashboardFragment extends RestrictedDashboardFra
         controllers.add(new StrictModePreferenceController(context));
         controllers.add(new ProfileGpuRenderingPreferenceController(context));
         controllers.add(new KeepActivitiesPreferenceController(context));
-        controllers.add(new BackgroundProcessLimitPreferenceController(context));
         controllers.add(new CachedAppsFreezerPreferenceController(context));
         controllers.add(new ShowFirstCrashDialogPreferenceController(context));
         controllers.add(new AppsNotRespondingPreferenceController(context));