[IntentHandling] Extend the intent handling flag expiry milestone.

The intent handling feature is not ready, extend the intent handling
flag expiry milestone to 85.

Bug: 853604
Change-Id: I4160c649598fba7ab5930c00d43ed8072b9c152f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2096797Reviewed-by: Jeevan Shikaram <jshikaram@chromium.org>
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749023}

chrome/browser/flag-metadata.json

@@ -125,7 +125,7 @@
   {
     "name": "app-service-intent-handling",
     "owners": [ "chromeos-apps-foundation-team@google.com" ],
-    "expiry_milestone": 82
+    "expiry_milestone": 85
   },
   {
     "name": "arc-application-zoom",