flags: assign upcoming-ui-features

The plan is to just allow this flag to expire.

Bug: None
Change-Id: I1dc6dcf008de71d852666a9ad79469343f008dc5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1529199
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Robert Liao <robliao@chromium.org>
Auto-Submit: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641710}
diff --git a/chrome/browser/flag-metadata.json b/chrome/browser/flag-metadata.json
index 67c1253..bb3bc53 100644
--- a/chrome/browser/flag-metadata.json
+++ b/chrome/browser/flag-metadata.json
@@ -3017,7 +3017,7 @@
   },
   {
     "name": "upcoming-ui-features",
-    // "owners": [ "your-team" ],
+    "owners": [ "robliao" ],
     "expiry_milestone": 76
   },
   {