Do not implement EventTarget on SVGElementInstance

Source/core/events/EventPath.cpp

Index: Source/core/events/EventPath.cpp
diff --git a/Source/core/events/EventPath.cpp b/Source/core/events/EventPath.cpp
index b9578b1f20984c619bd3a8c6cf352138dba24b45..05016beb91a802c6556efd100b15ce87aff0acc2 100644
--- a/Source/core/events/EventPath.cpp
+++ b/Source/core/events/EventPath.cpp
@@ -39,7 +39,6 @@
 #include "core/events/MouseEvent.h"
 #include "core/events/TouchEvent.h"
 #include "core/events/TouchEventContext.h"
-#include "core/svg/SVGElementInstance.h"
 #include "core/svg/SVGUseElement.h"
 
 namespace WebCore {
@@ -62,16 +61,10 @@ EventTarget* EventPath::eventTargetRespectingTargetRules(Node* referenceNode)
     if (!usesDeprecatedSVGUseTreeEventRules(referenceNode))

[pdr., 2014/06/02 14:09:06]

I thought we could remove all svg-specific logic here, though I may be missing
something.

         return referenceNode;
 
-    // Spec: The event handling for the non-exposed tree works as if the referenced element had been textually included
-    // as a deeply cloned child of the 'use' element, except that events are dispatched to the SVGElementInstance objects.
     Node& rootNode = referenceNode->treeScope().rootNode();
     Element* shadowHostElement = rootNode.isShadowRoot() ? toShadowRoot(rootNode).host() : 0;
-    // At this time, SVG nodes are not supported in non-<use> shadow trees.
-    if (!isSVGUseElement(shadowHostElement))
-        return referenceNode;
-    SVGUseElement& useElement = toSVGUseElement(*shadowHostElement);
-    if (SVGElementInstance* instance = useElement.instanceForShadowTreeElement(referenceNode))
-        return instance;
+    if (isSVGUseElement(shadowHostElement))
+        return shadowHostElement;
 
     return referenceNode;
 }