GitLab

Use enum class instead of enum for FocusManager::Direction.
enum class is more type safety.

Bug: 940736
Change-Id: I2cce66fe638739b602637f756e6470d3a553e75c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2497733Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Hwanseung Lee <hwanseung@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821568}