to HTMLFormControlElementWithState*.
https://bugs.webkit.org/show_bug.cgi?id=74998

Reviewed by Andreas Kling.

No new tests. Just refactoring.

* dom/Document.cpp:
(WebCore::Document::formElementsState): Use HTMLFormControlElementWithState*.
* dom/Document.h:
(WebCore::Document::registerFormElementWithState): Change the argument type.
(WebCore::Document::unregisterFormElementWithState): ditto.
(WebCore::Document::formElements): Renamed from getFormElements().
* dom/Element.h:
Removed shouldSaveAndRestoreFormControlState(), saveFormControlState(),
and restoreFormControlState() because they are not called for Element
anymore.
* html/HTMLFormControlElement.h:
- Make formControlName() and formControlType() public.
 They are called from Document class.
- Make shouldSaveAndRestoreFormControlState() public, and non-virtual.
 This is called from Document class, and no other classes override this.
(WebCore::HTMLFormControlElementWithState::saveFormControlState):
Moved from Element.
(WebCore::HTMLFormControlElementWithState::restoreFormControlState): ditto.
* html/HTMLInputElement.cpp:
(WebCore::HTMLInputElement::updateCheckedRadioButtons):
Use HTMLFormControlElementWithState* instead of Element*.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@103491 268f45cc-cd09-0410-ab3c-d52691b4dbfc