Migrate from using deprecated api in webview in Files.app.

chrome/browser/resources/file_manager/js/share_dialog.js

 // Copyright 2013 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.
 
 'use strict';
 
 /**
  * @param {HTMLElement} parentNode Node to be parent for this dialog.
  * @constructor
  * @extends {cr.ui.dialogs.BaseDialog}
@@ skipping 38 matching lines @@
  * @param {function()} callback Completion callback.
  */
 ShareDialog.WebViewAuthorizer.prototype.initialize = function(callback) {
   if (this.initialized_) {
     callback();
     return;
   }
 
   var registerInjectionHooks = function() {
     this.webView_.removeEventListener('loadstop', registerInjectionHooks);
-    this.webView_.onBeforeSendHeaders.addListener(
+    this.webView_.request.onBeforeSendHeaders.addListener(
       this.authorizeRequest_.bind(this),
       {urls: [this.urlPattern_]},
       ['blocking', 'requestHeaders']);
     this.initialized_ = true;
     callback();
   }.bind(this);
 
   this.webView_.addEventListener('loadstop', registerInjectionHooks);
   this.webView_.setAttribute('src', 'data:text/html,');
 };
@@ skipping 194 matching lines @@
   }.bind(this));
 };
 
 /**
  * Tells whether the share dialog is being shown or not.
  * @return {boolean} True if shown, false otherwise.
  */
 ShareDialog.prototype.isShowing = function() {
   return this.container_.classList.contains('shown');
 };