Chromium change:

https://chromium.googlesource.com/chromium/src/+/5b9e43d976aca377588875fc59c5348ede02a8b5

commit 5b9e43d976aca377588875fc59c5348ede02a8b5
Author: Hwanseung Lee <hs1217.lee@samsung.com>
Date:   Tue Jun 25 01:55:32 2019 +0000

    Convert enum to enum class for BoxLayout::Orientation

    Use enum class instead of enum for BoxLayout::Orientation
    enum class is more type safety.

    Bug: 940736