Shimless: Add close button to logs dialog

screenshot: http://screen/9X6ctMVuj7bGKKX

Fixed: b/257524996
Tests: browser_tests
Change-Id: Ia725f218254cbc3ab316915231234b3325812129
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4006993


Commit-Queue: Xiangdong Kong <xiangdongkong@google.com>
Auto-Submit: Gavin Williams <gavinwill@chromium.org>
Reviewed-by: Xiangdong Kong <xiangdongkong@google.com>
Cr-Commit-Position: refs/heads/main@{#1067725}