Take ownership of BTS CUS flag.

Change-Id: I7db9d09d2ccf6cfa8ba11302464a6fb316aff79b
Reviewed-on: https://chromium-review.googlesource.com/c/1342767Reviewed-by: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609380}

chrome/browser/flag-metadata.json

@@ -309,7 +309,7 @@
   },
   {
     "name": "background-task-component-update",
-    // "owners": [ "your-team" ],
+    "owners": [ "sorin", "waffles", "tiborg" ],
     "expiry_milestone": 76
   },
   {