👀 Cleanup DocumentMode migration helpers.

chrome/android/java/src/org/chromium/chrome/browser/preferences/DocumentModePreference.java

Index: chrome/android/java/src/org/chromium/chrome/browser/preferences/DocumentModePreference.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/preferences/DocumentModePreference.java b/chrome/android/java/src/org/chromium/chrome/browser/preferences/DocumentModePreference.java
deleted file mode 100644
index 2ffde51fd9a2a62c6329902ec52d55e6dfafb2d0..0000000000000000000000000000000000000000
--- a/chrome/android/java/src/org/chromium/chrome/browser/preferences/DocumentModePreference.java
+++ /dev/null
@@ -1,135 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package org.chromium.chrome.browser.preferences;
-
-import android.annotation.TargetApi;
-import android.app.ActivityManager;
-import android.app.ActivityManager.AppTask;
-import android.content.Context;
-import android.content.DialogInterface;
-import android.content.pm.PackageManager;
-import android.os.Build;
-import android.os.Bundle;
-import android.preference.Preference;
-import android.preference.Preference.OnPreferenceChangeListener;
-import android.preference.PreferenceFragment;
-import android.preference.SwitchPreference;
-import android.support.v7.app.AlertDialog;
-
-import org.chromium.base.metrics.RecordUserAction;
-import org.chromium.chrome.R;
-import org.chromium.chrome.browser.IntentHandler;
-import org.chromium.chrome.browser.document.DocumentActivity;
-import org.chromium.chrome.browser.document.DocumentMigrationHelper;
-import org.chromium.chrome.browser.document.DocumentUtils;
-
-import java.util.List;
-
-/**
- * A preference to control whether user's tabs are appearing in the tab switcher.
- */
-public class DocumentModePreference extends PreferenceFragment {
-
-    private static final String PREF_DOCUMENT_MODE_SWITCH = "document_mode_switch";
-    private SwitchPreference mDocumentModeSwitch;
-    private DocumentModeManager mDocumentModeManager;
-
-    @Override
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        addPreferencesFromResource(R.xml.document_mode_preferences);
-        getActivity().setTitle(R.string.tabs_and_apps_title);
-
-        mDocumentModeManager = DocumentModeManager.getInstance(getActivity());
-
-        mDocumentModeSwitch = (SwitchPreference) findPreference(PREF_DOCUMENT_MODE_SWITCH);
-
-        boolean isdocumentModeEnabled = !mDocumentModeManager.isOptedOutOfDocumentMode();
-        mDocumentModeSwitch.setChecked(isdocumentModeEnabled);
-
-        mDocumentModeSwitch.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
-            @Override
-            public boolean onPreferenceChange(Preference preference, Object newValue) {
-                if ((boolean) newValue == !mDocumentModeManager.isOptedOutOfDocumentMode()) {
-                    return true;
-                }
-                createOptOutAlertDialog((boolean) newValue).show();
-                return true;
-            }
-        });
-    }
-
-    private AlertDialog createOptOutAlertDialog(final boolean optOut) {
-        final boolean isSwitchEnabled = !mDocumentModeManager.isOptedOutOfDocumentMode();
-
-        AlertDialog dialog = new AlertDialog.Builder(getActivity(), R.style.AlertDialogTheme)
-                .setTitle(optOut ? R.string.tabs_and_apps_turn_on_title
-                        : R.string.tabs_and_apps_turn_off_title)
-                .setMessage(optOut ? R.string.tabs_and_apps_opt_in_confirmation
-                        : R.string.tabs_and_apps_opt_out_confirmation)
-                .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
-                    @Override
-                    public void onClick(DialogInterface dialog, int id) {
-                        mDocumentModeSwitch.setChecked(isSwitchEnabled);
-                        dialog.dismiss();
-                    }
-                })
-                .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
-                        dialog.dismiss();
-                        if (optOut) {
-                            RecordUserAction.record("DocumentActivity_UserOptOut");
-                        } else {
-                            RecordUserAction.record("DocumentActivity_UserOptIn");
-                        }
-                        mDocumentModeManager.setOptedOutState(optOut
-                                ? DocumentModeManager.OPT_OUT_PROMO_DISMISSED
-                                : DocumentModeManager.OPTED_OUT_OF_DOCUMENT_MODE);
-                        mDocumentModeManager.setOptOutCleanUpPending(true);
-                        DocumentMigrationHelper.migrateTabs(
-                                optOut, getActivity(), isRestartNeeded(optOut));
-                    }
-                })
-                .setOnCancelListener(new DialogInterface.OnCancelListener() {
-                    @Override
-                    public void onCancel(DialogInterface dialog) {
-                        mDocumentModeSwitch.setChecked(isSwitchEnabled);
-                    }
-                })
-                .create();
-
-        return dialog;
-    }
-
-    /**
-     * Figure out whether we need to restart the application after the tab migration is complete.
-     * We don't need to restart if this is being accessed from FRE and no document activities have
-     * been created yet.
-     * @param optOut This is true when we are starting out in opted-out mode.
-     * @return Whether to restart the application.
-     */
-    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
-    private boolean isRestartNeeded(boolean optOut) {
-        if (optOut) return true;
-        boolean isFromFre = getActivity().getIntent() != null
-                && getActivity().getIntent().getBooleanExtra(
-                      IntentHandler.EXTRA_INVOKED_FROM_FRE, false);
-        if (!isFromFre) return true;
-
-        ActivityManager am = (ActivityManager) getActivity().getSystemService(
-                Context.ACTIVITY_SERVICE);
-        PackageManager pm = getActivity().getPackageManager();
-        List<AppTask> taskList = am.getAppTasks();
-
-        for (int i = 0; i < taskList.size(); i++) {
-            String className = DocumentUtils.getTaskClassName(taskList.get(i), pm);
-            if (className == null) continue;
-            if (DocumentActivity.isDocumentActivity(className)) return true;
-        }
-        return false;
-    }
-
-}