Increase expiration milestone for sync-error-infobar flag

Change-Id: Ibdce0a751ec9754fac8395feb1168e85db6ea9bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2064909Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Commit-Queue: Tanmoy Mollik <triploblastic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743040}

chrome/browser/flag-metadata.json

@@ -3473,7 +3473,7 @@
   {
     "name": "sync-error-infobar",
     "owners": [ "triploblastic", "bsazonov" ],
-    "expiry_milestone": 82
+    "expiry_milestone": 85
   },
   {
     "name": "sync-setup-friendly-settings",