Adding extensions ids to Chrome Feedback whitelist.

BUG=478929

Review URL: https://codereview.chromium.org/1096133003

Cr-Commit-Position: refs/heads/master@{#326685}

chrome/browser/resources/feedback/js/event_handler.js

@@ -63,6 +63,8 @@ var whitelistedExtensionIds = [
   'E216473E4D15C5FB14522D32C5F8DEAAB2CECDC6', // http://crbug.com/470411
   '676A08383D875E51CE4C2308D875AE77199F1413', // http://crbug.com/473845
   '869A23E11B308AF45A68CC386C36AADA4BE44A01', // http://crbug.com/473845
+  'A4577D8C2AF4CF26F40CBCA83FFA4251D6F6C8F8', // http://crbug.com/478929
+  'A8208CCC87F8261AFAEB6B85D5E8D47372DDEA6B', // http://crbug.com/478929
 ];