Revert "Updated SP.SiteCreator to provide ChromeControl and have some proper UI."

This reverts commit f55635b719ac59c777711afe824cd666c639b604.
Revert "Revert "Updated SP.SiteCreator to provide ChromeControl and have some proper UI.""

This reverts commit e16f11c4a3430adaf7446231ed0ece28dc3a9614.