Reviewed by Andreas Kling.

It is common to traverse through a subtree looking for elements of specific type and then casting to the type. This pattern can be generalized.
        
This patch adds a new Traversal<typename ElementType> template. It works like ElementTraversal except that the traversal is limited to the specified type.
The patch also uses the template in a bunch of applicable places.

* WebCore.exp.in:
* accessibility/AccessibilityRenderObject.cpp:
(WebCore::AccessibilityRenderObject::addImageMapChildren):
* dom/Document.cpp:
(WebCore::Document::removeTitle):
(WebCore::Document::updateBaseURL):
(WebCore::Document::processBaseElement):
* dom/Element.h:
* dom/ElementTraversal.h:
(WebCore::::firstChildTemplate):
(WebCore::::firstWithinTemplate):
(WebCore::::lastChildTemplate):
(WebCore::::lastWithinTemplate):
(WebCore::::nextTemplate):
(WebCore::::previousTemplate):
(WebCore::::nextSiblingTemplate):
(WebCore::::previousSiblingTemplate):
(WebCore::::nextSkippingChildrenTemplate):
(WebCore::::firstChild):
(WebCore::::lastChild):
(WebCore::::firstWithin):
(WebCore::::lastWithin):
(WebCore::::next):
(WebCore::::previous):
(WebCore::::nextSibling):
(WebCore::::previousSibling):
(WebCore::::nextSkippingChildren):
(WebCore::ElementTraversal::previousIncludingPseudo):
(WebCore::ElementTraversal::nextIncludingPseudo):
(WebCore::ElementTraversal::nextIncludingPseudoSkippingChildren):
(WebCore::ElementTraversal::pseudoAwarePreviousSibling):
* dom/Node.cpp:
(WebCore::Node::numberOfScopedHTMLStyleChildren):
* dom/NodeIterator.cpp:
(WebCore::NodeIterator::NodeIterator):
* dom/NodeIterator.h:
* dom/Traversal.cpp:
(WebCore::NodeIteratorBase::NodeIteratorBase):
(WebCore::NodeIteratorBase::acceptNode):
* dom/Traversal.h:
        
    Renamed existing class called Traversal to less generic NodeIteratorBase.

* dom/TreeScope.cpp:
(WebCore::TreeScope::labelElementForId):
(WebCore::TreeScope::findAnchor):
* dom/TreeWalker.cpp:
(WebCore::TreeWalker::TreeWalker):
* dom/TreeWalker.h:
* editing/FrameSelection.cpp:
(WebCore::scanForForm):
* editing/markup.cpp:
(WebCore::createContextualFragment):
* html/HTMLAnchorElement.h:
(WebCore::isHTMLAnchorElement):
(WebCore::HTMLAnchorElement):
* html/HTMLAreaElement.h:
(WebCore::isHTMLAreaElement):
(WebCore::HTMLAreaElement):
* html/HTMLBaseElement.h:
(WebCore::isHTMLBaseElement):
(WebCore::HTMLBaseElement):
* html/HTMLElement.h:
(WebCore::HTMLElement):
* html/HTMLFieldSetElement.cpp:
(WebCore::HTMLFieldSetElement::invalidateDisabledStateUnder):
(WebCore::HTMLFieldSetElement::childrenChanged):
(WebCore::HTMLFieldSetElement::legend):
* html/HTMLFormControlElement.h:
(WebCore::toHTMLFormControlElement):
(WebCore::HTMLFormControlElement):
* html/HTMLLabelElement.cpp:
(WebCore::nodeAsSupportedLabelableElement):
(WebCore::HTMLLabelElement::control):
* html/HTMLLabelElement.h:
(WebCore::isHTMLLabelElement):
(WebCore::HTMLLabelElement):
* html/HTMLLegendElement.h:
(WebCore::isHTMLLegendElement):
(WebCore::HTMLLegendElement):
* html/HTMLMapElement.cpp:
(WebCore::HTMLMapElement::mapMouseEvent):
* html/HTMLMediaElement.cpp:
(WebCore::HTMLMediaElement::finishParsingChildren):
* html/HTMLStyleElement.h:
(WebCore::isHTMLStyleElement):
(WebCore::HTMLStyleElement):
* html/HTMLTitleElement.h:
(WebCore::HTMLTitleElement):
* html/HTMLTrackElement.h:
(WebCore::isHTMLTrackElement):
(WebCore::HTMLTrackElement):
* html/LabelableElement.h:
(WebCore::isLabelableElement):
(WebCore::LabelableElement):
* rendering/FilterEffectRenderer.cpp:
(WebCore::FilterEffectRenderer::buildReferenceFilter):
* svg/SVGElement.h:
(WebCore::SVGElement):
* svg/SVGForeignObjectElement.h:
(WebCore::isSVGForeignObjectElement):
(WebCore::SVGForeignObjectElement):
* svg/SVGSVGElement.cpp:
(WebCore::SVGSVGElement::collectIntersectionOrEnclosureList):
(WebCore::SVGSVGElement::getElementById):
* svg/SVGStyledElement.cpp:
(WebCore::SVGStyledElement::title):
* svg/SVGTitleElement.h:
(WebCore::SVGTitleElement):
* svg/animation/SMILTimeContainer.cpp:
(WebCore::SMILTimeContainer::updateDocumentOrderIndexes):
* svg/animation/SVGSMILElement.cpp:
(WebCore::SVGSMILElement::isSMILElement):
* svg/animation/SVGSMILElement.h:
(WebCore::SVGSMILElement):
* svg/graphics/SVGImage.cpp:
(WebCore::SVGImage::hasSingleSecurityOrigin):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154481 268f45cc-cd09-0410-ab3c-d52691b4dbfc