[Android] Add an about flag for Download Manager UI

chrome/android/java/src/org/chromium/chrome/browser/ChromeSwitches.java

 // Copyright 2014 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;
 
 /**
  * Contains all of the command line switches that are specific to the chrome/
  * portion of Chromium on Android.
  */
@@ skipping 68 matching lines @@
     /**
      * Forces the update menu badge to show.
      */
     public static final String FORCE_SHOW_UPDATE_MENU_BADGE = "force-show-update-menu-badge";
 
     /**
      * Sets the market URL for Chrome for use in testing.
      */
     public static final String MARKET_URL_FOR_TESTING = "market-url-for-testing";
 
-    /** Enables the download manager UI. */
-    public static final String ENABLE_DOWNLOAD_MANAGER_UI = "enable-download-manager-ui";
-
     ///////////////////////////////////////////////////////////////////////////////////////////////
     // Native Switches
     ///////////////////////////////////////////////////////////////////////////////////////////////
 
     /** Enable the DOM Distiller. */
     public static final String ENABLE_DOM_DISTILLER = "enable-dom-distiller";
 
     /**
      * Use sandbox Wallet environment for requestAutocomplete.
      * Native switch - autofill::switches::kWalletServiceUseSandbox.
@@ skipping 127 matching lines @@
 
     /**
      * Forces the WebAPK runtime dex to be extracted each time that Chrome is started.
      */
     public static final String ALWAYS_EXTRACT_WEBAPK_RUNTIME_DEX_ON_STARTUP =
             "always-extract-webapk-dex-on-startup";
 
     // Prevent instantiation.
     private ChromeSwitches() {}
 }