Reviewed by Eric Seidel.

        Cleanup: Fold shadowParentNode into shadowHost
        https://bugs.webkit.org/show_bug.cgi?id=51059

        Replaces all uses of shadowParentNode.

        No new tests because no behavior has changed.

        * css/CSSStyleSelector.cpp:
        (WebCore::CSSStyleSelector::initForStyleResolve):
        * dom/Node.cpp:
        (WebCore::Node::shadowHost):
        (WebCore::Node::shadowAncestorNode):
        (WebCore::eventTargetRespectingSVGTargetRules):
        (WebCore::Node::getEventAncestors):
        * dom/Node.h:
        * editing/Editor.cpp:
        (WebCore::Editor::findString):
        * page/DragController.cpp:
        (WebCore::asFileInput):
        * page/EventHandler.cpp:
        (WebCore::EventHandler::handleMousePressEvent):
        (WebCore::instanceAssociatedWithShadowTreeElement):
        (WebCore::EventHandler::dispatchMouseEvent):
        * rendering/RenderBlock.cpp:
        (WebCore::RenderBlock::hasLineIfEmpty):
        * rendering/RenderSVGShadowTreeRootContainer.cpp:
        (WebCore::RenderSVGShadowTreeRootContainer::updateFromElement):
        * svg/SVGStyledElement.cpp:
        (WebCore::SVGStyledElement::title):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@75287 268f45cc-cd09-0410-ab3c-d52691b4dbfc