Add enforcedKAnon browser signal to reportWin

Change-Id: I8afab35e21105f9c0db7ca26efd66425b4b0ce95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4549387


Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Russ Hamilton <behamilton@google.com>
Cr-Commit-Position: refs/heads/main@{#1147383}