Update flag expiry for omnibox show full URLs feature

Change-Id: I10a4bc85fc77d2c7310c573a72adce4bb5fc076f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343769Reviewed-by: Carlos IL <carlosil@chromium.org>
Commit-Queue: Livvie Lin <livvielin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796190}

chrome/browser/flag-metadata.json

@@ -3259,7 +3259,7 @@
   {
     "name": "omnibox-context-menu-show-full-urls",
     "owners": [ "livvielin", "chrome-security-enamel@google.com" ],
-    "expiry_milestone": 85
+    "expiry_milestone": 87
   },
   {
     "name": "omnibox-deferred-keyboard-popup",