Android: Extend gesturenav/ephemeraltab flag to M85

Extends the experiments to M85 so the flag options will be visible.

Change-Id: I4643b2dcc0167af9a6e9ad2d0a85ec7ae1d027f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2081715
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Donn Denman <donnd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746148}

chrome/browser/flag-metadata.json

@@ -1239,12 +1239,12 @@
   {
     "name": "enable-ephemeral-tab",
     "owners": [ "donnd", "jinsukkim" ],
-    "expiry_milestone": 82
+    "expiry_milestone": 85
   },
   {
     "name": "enable-ephemeral-tab-bottom-sheet",
     "owners": [ "donnd", "jinsukkim" ],
-    "expiry_milestone": 82
+    "expiry_milestone": 85
   },
   {
     "name": "enable-experimental-accessibility-autoclick",
@@ -2945,7 +2945,7 @@
   {
     "name": "overscroll-history-navigation",
      "owners": [ "mohsen", "jinsukkim" ],
-     "expiry_milestone": 82
+     "expiry_milestone": 85
   },
   {
     "name": "paint-preview-test",