draft: CEF128+: Avoid crash on OnProtocolExecution

[HashidaTKS]

Which issue(s) this PR fixes:

https://github.com/ThinBridge/Chronos-SG/issues/305

What this PR does / why we need it:

This is a Chronos side temporary patch for chromiumembedded/cef#3851.

Using CefBrowser->StopLoad() with allow_os_execution = true causes a crash on CEF128+.
In order to avoid the crash, specifying allow_os_execution = false on CEF128+, but this blocks to execute applications installed in OS. E.g. Zoom application for Windows.

We should specify allow_os_execution = true after the bug on CEF128+ is fixed.

How to verify the fixed issue:

• Access a Zoom meeting page URL.
  • Confirm that Chronos does not crash.
  • Confirm that a dialog to confirm to open OS application is not displayed.
• Click the "Launch meeting" ("ミーティングを起動する") button
  • Confirm that Chronos does not crash.
  • Confirm that nothing happens
• Click the "Join from your browser" ("ブラウザから参加") link
  • Confirm that a Zoom meeting room is displayed.
• Access a Teams meeting page URL.
  • Confirm that Chronos does not crash.
• Click the "Join on the Teams app" ("Teams アプリで参加する") button
  • Confirm that Chronos does not crash.
  • Confirm that nothing happens
• Click the "Continue on this browser" ("このブラウザーで続ける") link
  • Confirm that a Teams meeting room is displayed.

[kenhys]

LGTM.