Mark 'download' permissionrequest stable for <webview>.

chrome/renderer/resources/extensions/web_view.js

 // Copyright (c) 2012 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.
 
 // Shim that simulates a <webview> tag via Mutation Observers.
 //
 // The actual tag is implemented via the browser plugin. The internals of this
 // are hidden via Shadow DOM.
 
 var addTagWatcher = require('tagWatcher').addTagWatcher;
@@ skipping 521 matching lines @@
   }
   this.webviewNode_['insertCSS'] = function(var_args) {
     validateCall();
     var args = $Array.concat([self.browserPluginNode_.getGuestInstanceId()],
                              $Array.slice(arguments));
     $Function.apply(chrome.webview.insertCSS, null, args);
   }
 };
 
 /**
- * @private
- */
-WebView.prototype.getPermissionTypes_ = function() {
-  var PERMISSION_TYPES = ['media', 'geolocation', 'pointerLock'];
-  return PERMISSION_TYPES.concat(this.maybeGetExperimentalPermissionTypes_());
-};
-
-/**
  * @param {!Object} detail The event details, originated from <object>.
  * @private
  */
 WebView.prototype.setupPermissionEvent_ = function() {
   var ERROR_MSG_PERMISSION_ALREADY_DECIDED = '<webview>: ' +
       'Permission has already been decided for this "permissionrequest" event.';
 
   var showWarningMessage = function(permission) {
     var WARNING_MSG_PERMISSION_DENIED = '<webview>: ' +
         'The permission request for "%1" has been denied.';
     console.warn(WARNING_MSG_PERMISSION_DENIED.replace('%1', permission));
   };
 
-  var PERMISSION_TYPES = this.getPermissionTypes_();
+  var PERMISSION_TYPES = ['media', 'geolocation', 'pointerLock', 'download'];
 
   var EXPOSED_PERMISSION_EVENT_ATTRIBS = [
       'lastUnlockedBySelf',
       'permission',
       'requestMethod',
       'url',
       'userGesture'
   ];
 
   var self = this;
@@ skipping 68 matching lines @@
       browserPluginNode['-internal-setPermission'](requestId, false, '');
       showWarningMessage(detail.permission);
     }
   });
 };
 
 /**
  * Implemented when the experimental API is available.
  * @private
  */
-WebView.prototype.maybeGetExperimentalPermissionTypes_ = function() {
-  return [];
-};
-
-/**
- * Implemented when the experimental API is available.
- * @private
- */
 WebView.prototype.maybeSetupExperimentalAPI_ = function() {};
 
 exports.WebView = WebView;