HasIDFlag and HasClassFlag can be removed.

HasIDFlag and HasClassFlag can be removed.
https://bugs.webkit.org/show_bug.cgi?id=77861

Reviewed by Andreas Kling.

Replaced HasIDFlag and HasClassFlag with a check against
ElementAttributeData. It looks these flags (originally bitfields)
were legacy of ancient era, where we didn't cache @id and @class
values and needed a hash lookup for each check.

No new tests. No behavioral change.

* dom/Element.cpp:
(WebCore::Element::idAttributeChanged):
* dom/Element.h:
(WebCore::Element::hasID):
(WebCore):
(WebCore::Element::hasClass):
(WebCore::Node::hasID):
(WebCore::Node::hasClass):
* dom/ElementAttributeData.h:
(WebCore::ElementAttributeData::hasID):
(WebCore::ElementAttributeData::hasClass):
(ElementAttributeData):
* dom/Node.h:
(Node):
(WebCore::nodeStyleChangeShift):
* dom/StyledElement.cpp:
(WebCore::StyledElement::classAttributeChanged):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@108449 268f45cc-cd09-0410-ab3c-d52691b4dbfc