GitLab

To enable CCA on guest mode, CameraAppWindowManager cannot be a
KeyedService since it does not work under guest mode.

Therefore, this CL changes CameraAppWindowManager as a singleton object.

Bug: b/172343942
Test: Manually
Change-Id: Ia4e8970e2e2083af6db58f20d22f00ab17f20b92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2592184
Commit-Queue: Wei Lee <wtlee@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837043}