Fix feedback attach a file and system info code.

chrome/common/extensions/api/feedback_private.idl

 // 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 the <code>chrome.feedbackPrivate</code> API to provide Chrome [OS]
 // feedback to the Google Feedback servers.
 namespace feedbackPrivate {
 
   dictionary AttachedFile {
     DOMString name;
-    [instanceOf=Blob] object data;
+    [instanceOf=Blob] object? data;
   };
 
   dictionary SystemInformation {
     DOMString key;
     DOMString value;
   };
 
   dictionary FeedbackInfo {
     // File to attach to the feedback report.
     AttachedFile? attachedFile;
@@ skipping 54 matching lines @@
   };
 
   interface Events {
     // Fired when the a user requests the launch of the feedback UI. We're
     // using an event for this versus using the override API since we want
     // to be invoked, but not showing a UI, so the feedback extension can
     // take a screenshot of the user's desktop.
     static void onFeedbackRequested(FeedbackInfo feedback);
   };
 };