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

content/browser/resources/media/dump_creator.js

Index: content/browser/resources/media/dump_creator.js
diff --git a/content/browser/resources/media/dump_creator.js b/content/browser/resources/media/dump_creator.js
index 33abe57e1e845a4463b479bf82a302170901215e..06a1b38444b5eeafd11318b3d6d01153ac174e14 100644
--- a/content/browser/resources/media/dump_creator.js
+++ b/content/browser/resources/media/dump_creator.js
@@ -55,11 +55,16 @@ var DumpCreator = (function() {
   }
 
   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.
      *