Revert the feature of the <shadow> element as 'a function call' to the previous behavior.

LayoutTests/fast/dom/shadow/event-path-shadow-insertion-point-in-oldest-shadow-root.html

Index: LayoutTests/fast/dom/shadow/event-path-shadow-insertion-point-in-oldest-shadow-root.html
diff --git a/LayoutTests/fast/dom/shadow/event-path-shadow-insertion-point-in-oldest-shadow-root.html b/LayoutTests/fast/dom/shadow/event-path-shadow-insertion-point-in-oldest-shadow-root.html
index f59cd60973ecd41c13fc8fb093074ea1cd30f7e1..9c0bc5f19beb65a17d91751f6c7103b171e5ca21 100644
--- a/LayoutTests/fast/dom/shadow/event-path-shadow-insertion-point-in-oldest-shadow-root.html
+++ b/LayoutTests/fast/dom/shadow/event-path-shadow-insertion-point-in-oldest-shadow-root.html
@@ -17,14 +17,12 @@ sandbox.appendChild(
                         createDOM('div', {'id': 'C'})),
               createShadowRoot({'id': 'D'},
                                createDOM('div', {'id': 'E'},
-                                         createDOM('shadow', {'id': 'X'},
-                                                   createDOM('content', {'id': 'F'})))),
+                                         createDOM('shadow', {'id': 'X'}))),
               createShadowRoot({'id': 'G'},
                                createDOM('div', {'id': 'H'},
-                                         createDOM('shadow', {'id': 'I'},
-                                                   createDOM('content', {'id': 'J'}))))));
+                                         createDOM('shadow', {'id': 'I'})))));
 
-['A', 'B', 'C', 'A/', 'A/E', 'A/F', 'A/X', 'A//', 'A//H', 'A//I', 'A//J'].forEach(function(path) {
+['A', 'B', 'C', 'A/', 'A/E', 'A/X', 'A//', 'A//H', 'A//I'].forEach(function(path) {
     getNodeInTreeOfTrees(path).addEventListener('click', function(event) {
         debug('\nevent.path on node ' + dumpNode(event.currentTarget));
         debug(dumpNodeList(event.path));