Reviewed by Adam Barth.

        Rename Node::isShadowNode to isShadowRoot
        https://bugs.webkit.org/show_bug.cgi?id=51060

        The method gets whether the node is the root of a shadow tree;
        renamed to reflect intent.

        A simple rename--no new tests needed.

        * css/CSSStyleSelector.cpp:
        (WebCore::CSSStyleSelector::initForStyleResolve):
        (WebCore::CSSStyleSelector::SelectorChecker::checkSelector):
        * dom/Node.cpp:
        (WebCore::Node::shadowTreeRootNode):
        (WebCore::Node::isInShadowTree):
        (WebCore::eventTargetRespectingSVGTargetRules):
        (WebCore::Node::getEventAncestors):
        * dom/Node.h:
        (WebCore::Node::isShadowRoot):
        * dom/Range.cpp:
        (WebCore::Range::checkNodeBA):
        * page/DragController.cpp:
        (WebCore::asFileInput):
        * page/EventHandler.cpp:
        (WebCore::EventHandler::handleMousePressEvent):
        (WebCore::EventHandler::dispatchMouseEvent):
        * rendering/RenderBlock.cpp:
        (WebCore::RenderBlock::hasLineIfEmpty):
        * rendering/TextControlInnerElements.cpp:
        (WebCore::TextControlInnerElement::attachInnerElement):
        * svg/SVGStyledElement.cpp:
        (WebCore::SVGStyledElement::title):
        * svg/SVGUseElement.cpp:
        (WebCore::ShadowTreeUpdateBlocker::while):
        * svg/animation/SVGSMILElement.cpp:
        (WebCore::SVGSMILElement::insertedIntoDocument):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@74406 268f45cc-cd09-0410-ab3c-d52691b4dbfc