Don't expose the user agent shadow tree

Source/core/events/Event.cpp

Index: Source/core/events/Event.cpp
diff --git a/Source/core/events/Event.cpp b/Source/core/events/Event.cpp
index e0a95408c02806e4cb6b5fb50cf09442f6f68f51..aa1ea8381d8cef1748e936c3656055763cf679ea 100644
--- a/Source/core/events/Event.cpp
+++ b/Source/core/events/Event.cpp
@@ -26,6 +26,7 @@
 #include "core/dom/StaticNodeList.h"
 #include "core/events/EventTarget.h"
 #include "core/frame/UseCounter.h"
+#include "core/svg/SVGElement.h"
 #include "wtf/CurrentTime.h"
 
 namespace WebCore {
@@ -233,6 +234,18 @@ PassRefPtrWillBeRawPtr<NodeList> Event::path() const
     return StaticNodeList::createEmpty();
 }
 
+EventTarget* Event::currentTarget() const
+{
+    if (!m_currentTarget)
+        return 0;
+    Node* node = m_currentTarget->toNode();
+    if (node && node->isSVGElement()) {
+        if (SVGElement* svgElement = toSVGElement(node)->correspondingElement())
+            return svgElement;
+    }
+    return m_currentTarget;
+}
+
 void Event::trace(Visitor* visitor)
 {
     visitor->trace(m_target);