✈ Remove unnecessary flag and DocumentModeManager.

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

-// 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.content.Context;
-import android.content.SharedPreferences;
-
-import org.chromium.base.ContextUtils;
-import org.chromium.base.ThreadUtils;
-import org.chromium.base.VisibleForTesting;
-
-/**
- * Tracks opt out status for document mode
- */
-public class DocumentModeManager {
-
-    public static final String OPT_OUT_STATE = "opt_out_state";
-    public static final int OPT_OUT_STATE_UNSET = -1;
-    public static final int OPT_IN_TO_DOCUMENT_MODE = 0;
-    public static final int OPT_OUT_PROMO_DISMISSED = 1;
-    public static final int OPTED_OUT_OF_DOCUMENT_MODE = 2;
-    public static final String OPT_OUT_SHOWN_COUNT = "opt_out_shown_count";
-    public static final String OPT_OUT_CLEAN_UP_PENDING = "opt_out_clean_up_pending";
-
-    private static DocumentModeManager sManager;
-
-    private final SharedPreferences mSharedPreferences;
-
-    private DocumentModeManager(Context context) {
-        mSharedPreferences = ContextUtils.getAppSharedPreferences();
-    }
-
-    /**
-     * Get the static instance of DocumentModeManager if it exists, else create it.
-     * @param context The current Android context
-     * @return the DocumentModeManager singleton
-     */
-    public static DocumentModeManager getInstance(Context context) {
-        ThreadUtils.assertOnUiThread();
-        if (sManager == null) {
-            sManager = new DocumentModeManager(context);
-        }
-        return sManager;
-    }
-
-    /**
-     * @return Whether the user set a preference to not use the document mode.
-     */
-    public boolean isOptedOutOfDocumentMode() {
-        return getOptOutState() == OPTED_OUT_OF_DOCUMENT_MODE;
-    }
-
-    /**
-     * Sets the opt out preference.
-     * @param state One of OPTED_OUT_OF_DOCUMENT_MODE or OPT_OUT_PROMO_DISMISSED.
-     */
-    public void setOptedOutState(int state) {
-        SharedPreferences.Editor sharedPreferencesEditor = mSharedPreferences.edit();
-        sharedPreferencesEditor.putInt(OPT_OUT_STATE, state);
-        sharedPreferencesEditor.apply();
-    }
-
-    /**
-     * @return Whether we need to clean up old document activity tasks from Recents.
-     */
-    public boolean isOptOutCleanUpPending() {
-        return mSharedPreferences.getBoolean(OPT_OUT_CLEAN_UP_PENDING, false);
-    }
-
-    /**
-     * Mark that we need to clean up old documents from Recents or reset it after the task
-     * is done.
-     * @param pending Whether we need to clean up.
-     */
-    public void setOptOutCleanUpPending(boolean pending) {
-        SharedPreferences.Editor sharedPreferencesEditor = mSharedPreferences.edit();
-        sharedPreferencesEditor.putBoolean(OPT_OUT_CLEAN_UP_PENDING, pending);
-        sharedPreferencesEditor.apply();
-    }
-
-    private int getOptOutState() {
-        int optOutState = mSharedPreferences.getInt(OPT_OUT_STATE, OPT_OUT_STATE_UNSET);
-        if (optOutState == OPT_OUT_STATE_UNSET) {
-            boolean hasMigrated = mSharedPreferences.getBoolean(
-                    ChromePreferenceManager.MIGRATION_ON_UPGRADE_ATTEMPTED, false);
-            if (!hasMigrated) {
-                optOutState = OPTED_OUT_OF_DOCUMENT_MODE;
-            } else {
-                optOutState = OPT_IN_TO_DOCUMENT_MODE;
-            }
-            setOptedOutState(optOutState);
-        }
-        return optOutState;
-    }
-
-    @VisibleForTesting
-    public int getOptOutStateForTesting() {
-        return mSharedPreferences.getInt(OPT_OUT_STATE, OPT_OUT_STATE_UNSET);
-    }
-}