flags: assign enable-lock-screen-notification

Bug: None
Change-Id: Ie0f73b9cc7457bd4b39a73f26bb862e848f62611
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1598489
Auto-Submit: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Tim Song <tengs@chromium.org>
Reviewed-by: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657397}

chrome/browser/flag-metadata.json

@@ -1256,8 +1256,8 @@
   },
   {
     "name": "enable-lock-screen-notification",
-    // "owners": [ "your-team" ],
-    "expiry_milestone": 76
+    "owners": [ "tengs" ],
+    "expiry_milestone": 80
   },
   {
     "name": "enable-logging-js-console-messages",