flags: assign enable-show-autofill-signatures

Bug: None
Change-Id: Ia0fe5b5f50427e018fbc5d02e613b2ebd7c4b368
Reviewed-on: https://chromium-review.googlesource.com/c/1482564
Auto-Submit: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Maxim Kolosovskiy <kolos@chromium.org>
Reviewed-by: Maxim Kolosovskiy <kolos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634698}

chrome/browser/flag-metadata.json

@@ -1663,8 +1663,9 @@
   },
   {
     "name": "enable-show-autofill-signatures",
-    // "owners": [ "your-team" ],
-    "expiry_milestone": 76
+    "owners": [ "kolos" ],
+    // Used for debugging and QA by the autofill team for the indefinite future.
+    "expiry_milestone": -1
   },
   {
     "name": "enable-signed-http-exchange",