Make HTMLProgressElement::isDeterminate private
https://bugs.webkit.org/show_bug.cgi?id=113299

Reviewed by Kentaro Hara.

The only callsite of isDeterminate outside of HTMLProgressElement
is in StyleResolver::sharingCandidateHasIdenticalStyleAffectingAttributes,
and we can replace it with Element::shouldAppearIndeterminate.

No new tests. Just a refactoring.

* css/StyleResolver.cpp:
(WebCore::StyleResolver::sharingCandidateHasIdenticalStyleAffectingAttributes):
Use Element::shouldAppearIndeterminate.
* html/HTMLProgressElement.h:
(HTMLProgressElement): Make isDeterminate private.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146953 268f45cc-cd09-0410-ab3c-d52691b4dbfc