Upstream Chromium no longer supports hardware accelerated video decoding
on GNU/Linux, yet it still works fine on many systems.  This patch "unexpires"
the support.

Taken from Arch Linux:
https://github.com/archlinux/svntogit-packages/blob/packages/chromium/trunk/unexpire-accelerated-video-decode-flag.patch

--- a/chrome/browser/flag-metadata.json
+++ b/chrome/browser/flag-metadata.json
@@ -1285,7 +1285,7 @@
   {
     "name": "enable-accelerated-video-decode",
     "owners": [ "media-dev@chromium.org" ],
-    "expiry_milestone": 93
+    "expiry_milestone": 99
   },
   {
     "name": "enable-accessibility-live-caption",