[Android] Add an about flag for Download Manager UI

chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuPropertiesDelegate.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.appmenu;
 
 import android.text.TextUtils;
 import android.view.Menu;
 import android.view.MenuItem;
 
-import org.chromium.base.CommandLine;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeActivity;
-import org.chromium.chrome.browser.ChromeSwitches;
+import org.chromium.chrome.browser.ChromeFeatureList;
 import org.chromium.chrome.browser.ShortcutHelper;
 import org.chromium.chrome.browser.UrlConstants;
 import org.chromium.chrome.browser.bookmarks.BookmarkBridge;
 import org.chromium.chrome.browser.multiwindow.MultiWindowUtils;
 import org.chromium.chrome.browser.omaha.UpdateMenuItemHelper;
 import org.chromium.chrome.browser.preferences.ManagedPreferencesUtils;
 import org.chromium.chrome.browser.preferences.PrefServiceBridge;
 import org.chromium.chrome.browser.share.ShareHelper;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.util.FeatureUtilities;
@@ skipping 75 matching lines @@
                 forwardMenuItem.setEnabled(currentTab.canGoForward());
 
                 mReloadMenuItem = menu.findItem(R.id.reload_menu_id);
                 mReloadMenuItem.setIcon(R.drawable.btn_reload_stop);
                 loadingStateChanged(currentTab.isLoading());
 
                 MenuItem bookmarkMenuItem = menu.findItem(R.id.bookmark_this_page_id);
                 updateBookmarkMenuItem(bookmarkMenuItem, currentTab);
             }
 
-            menu.findItem(R.id.downloads_menu_id).setVisible(
-                    CommandLine.getInstance().hasSwitch(ChromeSwitches.ENABLE_DOWNLOAD_MANAGER_UI));
+            menu.findItem(R.id.downloads_menu_id)
+                    .setVisible(ChromeFeatureList.isEnabled("DownloadsUi"));
 
             menu.findItem(R.id.update_menu_id).setVisible(
                     UpdateMenuItemHelper.getInstance().shouldShowMenuItem(mActivity));
 
             menu.findItem(R.id.move_to_other_window_menu_id).setVisible(
                     MultiWindowUtils.getInstance().isOpenInOtherWindowSupported(mActivity));
 
             // Hide "Recent tabs" in incognito mode or when sync can't be enabled.
             MenuItem recentTabsMenuItem = menu.findItem(R.id.recent_tabs_menu_id);
             recentTabsMenuItem.setVisible(!isIncognito && FeatureUtilities.canAllowSync(mActivity));
@@ skipping 133 matching lines @@
             bookmarkMenuItem.setIcon(R.drawable.btn_star_filled);
             bookmarkMenuItem.setChecked(true);
             bookmarkMenuItem.setTitleCondensed(mActivity.getString(R.string.edit_bookmark));
         } else {
             bookmarkMenuItem.setIcon(R.drawable.btn_star);
             bookmarkMenuItem.setChecked(false);
             bookmarkMenuItem.setTitleCondensed(null);
         }
     }
 }