Ensure that WebRTC AEC recording checkbox is not set if cancelling file dialog.

content/browser/resources/media/dump_creator.js

 // Copyright (c) 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.
 
 
 /**
  * Provides the UI for dump creation.
  */
 var DumpCreator = (function() {
   /**
@@ skipping 37 matching lines @@
         ' non-existing file name. Selecting an existing file will append to' +
         ' it, not overwrite it, rendering the file invalid. </p>';
 
     content.getElementsByTagName('a')[0].addEventListener(
         'click', this.onDownloadData_.bind(this));
     content.getElementsByTagName('input')[0].addEventListener(
         'click', this.onAecRecordingChanged_.bind(this));
   }
 
   DumpCreator.prototype = {
-    /** Mark the AEC recording checkbox checked.*/
+    // Mark the AEC recording checkbox checked.
     enableAecRecording: function() {
       this.root_.getElementsByTagName('input')[0].checked = true;
     },
 
+    // Mark the AEC recording checkbox unchecked.
+    disableAecRecording: function() {
+      this.root_.getElementsByTagName('input')[0].checked = false;
+    },
+
     /**
      * Downloads the PeerConnection updates and stats data as a file.
      *
      * @private
      */
     onDownloadData_: function() {
       var dump_object =
       {
         'getUserMedia': userMediaRequests,
         'PeerConnections': peerConnectionDataStore,
@@ skipping 15 matching lines @@
       var enabled = this.root_.getElementsByTagName('input')[0].checked;
       if (enabled) {
         chrome.send('enableAecRecording');
       } else {
         chrome.send('disableAecRecording');
       }
     },
   };
   return DumpCreator;
 })();