GitLab

Use .find to determine if hwnd is a root window in
root_window_hwnds_occlusion_state_ instead of iterating
through it.

Bug: 1029842
Change-Id: I6e2fb476635e0479355983a07149ec7d85149f5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1949026
Commit-Queue: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721145}