https://bugs.webkit.org/show_bug.cgi?id=90820

Reviewed by Nikolas Zimmermann.

Source/WebCore:

Node::shadowAncestorNode returns the caller node itself for SVGElement. However,
since we have already implemented event retargeting algorithm in Shadow DOM, we don't have to
take a special care of SVGElement for Node.shadowAncestorNode() now.

This patch will removes the special care code and fixes infinite loop in document.elementFromPoint().

Test: svg/hittest/svg-use-element-from-point.html

* dom/Node.cpp:
(WebCore::Node::shadowAncestorNode):

LayoutTests:

* svg/hittest/svg-use-element-from-point-expected.txt: Added.
* svg/hittest/svg-use-element-from-point.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@122825 268f45cc-cd09-0410-ab3c-d52691b4dbfc