https://bugs.webkit.org/show_bug.cgi?id=120430

Reviewed by Andreas Kling

This patch adds const-correct DOM tree traversal iterators. It also uses them in a few places.
        
Some const_casts have been applied where constness breaks.

* dom/ChildIterator.h:
(WebCore::::ChildConstIterator):
(WebCore::::operator):
(WebCore::=):
(WebCore::::ChildConstIteratorAdapter):
(WebCore::::begin):
(WebCore::::end):
(WebCore::elementChildren):
(WebCore::childrenOfType):
* dom/DescendantIterator.h:
(WebCore::::DescendantConstIterator):
(WebCore::::operator):
(WebCore::=):
(WebCore::::DescendantConstIteratorAdapter):
(WebCore::::begin):
(WebCore::::end):
(WebCore::elementDescendants):
(WebCore::descendantsOfType):
* dom/Node.cpp:
(WebCore::Node::numberOfScopedHTMLStyleChildren):
* html/HTMLFieldSetElement.cpp:
(WebCore::HTMLFieldSetElement::legend):
* html/HTMLFieldSetElement.h:
* html/HTMLMediaElement.cpp:
(WebCore::HTMLMediaElement::finishParsingChildren):
* html/HTMLObjectElement.cpp:
(WebCore::HTMLObjectElement::containsJavaApplet):
* svg/SVGElement.cpp:
(WebCore::SVGElement::title):
* svg/SVGSVGElement.cpp:
(WebCore::SVGSVGElement::collectIntersectionOrEnclosureList):
(WebCore::SVGSVGElement::checkIntersection):
(WebCore::SVGSVGElement::checkEnclosure):
(WebCore::SVGSVGElement::getElementById):
* svg/SVGSVGElement.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154769 268f45cc-cd09-0410-ab3c-d52691b4dbfc