Protected function UploadBase->validateName changed to public

*Any class that is not part of the UploadBase class 
(so it can't call protected functions or members on an UploadBase object).
If you, for example,build an extension that uses an UploadBase instance,
there is no way to get the title validation error.

Bug: 38221

Change-Id: Ie6c3f95a09ef84777313c3ec2edd31c50c397e28
Merge "Protected function UploadBase->validateName changed to public"