cros: Move some *View classes into *Handler files

- KioskEnableScreenView
- MarketingOptInScreenView
- WrongHwidScreenView
- SyncConsentScreenView

Also remove the Delegate classes on the moved views where applicable.

Bug: 928555
Change-Id: Ia833a286b49dda8af7c93f7b5aacebe239f021d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1572539
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652630}
28 files changed