[Android] Extend flag for video support in the media picker.

Bug: None
Change-Id: Ib60c1d5bb40995d35d4a84e502c6dcee2072e356
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2509752Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822602}

chrome/browser/flag-metadata.json

@@ -3773,7 +3773,7 @@
   {
     "name": "photo-picker-video-support",
     "owners": [ "finnur" ],
-    "expiry_milestone": 86
+    "expiry_milestone": 92
   },
   {
     "name": "pluginvm-show-camera-permissions",