Use brave theme type as a system dark mode on Windows (uplift to 0.65.x)

[brave-builds]

Uplift of #2352

[simonhong]

This PR is failed by version mismatch like below.
I think it should be 0.65.90 because I rebased onto latest `0.65.x1 and chrome-VERSION.patch file is also for that.

09:54:28  Version files do not match!
09:54:28  src/chrome/VERSION: 0.65.88
09:54:28  brave-browser package.json version: 0.65.90

@bsclifton How can I solve this? I run Builder many times with wipe out workspace but no difference.

[kjozwiak]

Uplift to 0.65.x denied after deliberating with the @brave/uplift-approvers team. We're getting pretty close to the 0.65.x release and this introduces a lot of changes. The general rule for uplifting into the beta channel is critical regressions, security issues or anything that really needs to get into beta. Both https://github.com/brave/brave-browser/issues/4056 and https://github.com/brave/brave-browser/issues/4272 are labelled as P3and https://github.com/brave/brave-browser/issues/3804 is labelled asP5`. @simonhong if you any questions or concerns regarding the above, please let me know!