Draft: Add support for CEF125

[HashidaTKS]

Which issue(s) this PR fixes:

187

What this PR does / why we need it:

Add support for CEF125+.

The return type of OnBeforeDownload is changed to bool from void since CEF125.

https://github.com/chromiumembedded/cef/commit/be6642df3f3e0b723cc013678b90f180c8e0b9e6#diff-588cdd76e4e41fbae956a18785299071dc3ca7a3aa02eb065e85c25dbfac720eR116

How to verify the fixed issue:

• [x] Confirm if all build CI are passed
  • https://github.com/HashidaTKS/Chronos/actions/runs/9475055253
• [x] Confirm that a file can download on Chronos with CEF125
  • We cab download the Chronos with CEF125 from here: Chronos-stable

[HashidaTKS]

@kenhys

I requested a review accidentally, please ignore this review request.

[HashidaTKS]

@kenhys

Would you review this when you have time?