flags : Extend expiry milestone for oop raster.

R=ellyjones@chromium.org

Change-Id: Ieb33ec9e129f857c128970df6151d8896d66fecd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1947402
Auto-Submit: Khushal <khushalsagar@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721106}

chrome/browser/flag-metadata.json

@@ -1620,7 +1620,7 @@
   {
     "name": "enable-oop-rasterization",
     "owners": [ "enne", "khushalsagar" ],
-    "expiry_milestone": 80
+    "expiry_milestone": 86
   },
     {
     "name": "enable-paint-holding",