Disable html/semantics/forms/the-input-element/type-change-state.html.ini
auto merge of #3656 : Manishearth/servo/disable-type-change, r=Ms2ger

I haven't yet gotten to the root of this, but it's breaking the other PRs.
Add #[privatize] to allow enforcing private fields for struct definitions
Simple privatizations
Privatize Elements
Privatize Attr
Privatize CharacterData
Privatize Comment
Privatize DocumentType
Privatize EventTarget and EventListenerEntry
Privatize File
Privatize ProcessingInstruction
Privatize Text