flags: mcharland -> sebsg

Bug: 1148873
Change-Id: Ie5da1858ec02c78cf3d3d791392a8d8d93f6dc5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593758
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: sebsg <sebsg@chromium.org>
Reviewed-by: sebsg <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837308}

chrome/browser/flag-metadata.json

@@ -3001,7 +3001,7 @@
   },
   {
     "name": "illustrated-empty-states",
-    "owners": [ "mcharland", "tmartino" ],
+    "owners": [ "sebsg", "tmartino" ],
     "expiry_milestone": 88
   },
   {