Do not call an event listener on a cloned node in svg <use>'s UA shadow tree

third_party/WebKit/LayoutTests/svg/custom/use-instanceRoot-event-listener-liveness.xhtml

Index: third_party/WebKit/LayoutTests/svg/custom/use-instanceRoot-event-listener-liveness.xhtml
diff --git a/third_party/WebKit/LayoutTests/svg/custom/use-instanceRoot-event-listener-liveness.xhtml b/third_party/WebKit/LayoutTests/svg/custom/use-instanceRoot-event-listener-liveness.xhtml
index 62775aa49228b528c2dd61817f3c44c1a67b065b..695afaeff24819b39ace3e84ee9b83430e5c188e 100644
--- a/third_party/WebKit/LayoutTests/svg/custom/use-instanceRoot-event-listener-liveness.xhtml
+++ b/third_party/WebKit/LayoutTests/svg/custom/use-instanceRoot-event-listener-liveness.xhtml
@@ -19,10 +19,11 @@ if (window.testRunner) {
     testRunner.waitUntilDone();
 }
 
-function eventHandler()
+function eventHandler(event)
 {
     var divElement = document.getElementById("console");
-    divElement.textContent = "Test passed";
+    if (event.target == document.getElementById("test"))
+        divElement.textContent = "Test passed";
 
     if (window.testRunner)
         testRunner.notifyDone();
@@ -30,8 +31,7 @@ function eventHandler()
 
 function fireSimulatedMouseClickEvent(eventTarget)
 {
-    var event = document.createEvent("MouseEvents");
-    event.initMouseEvent("click", true, true, document.defaultView, 1, 0, 0, 0, 0, false, false, false, false, 0, null);
+    var event = new MouseEvent("click", { composed: true, bubbles: true });
     eventTarget.dispatchEvent(event);
 }
 
@@ -43,8 +43,9 @@ function startTest() {
     // No-op, as no listener is not yet registered
     fireSimulatedMouseClickEvent(shadowRoot.firstChild);
 
-    // Add listener
+    // Add listeners
     shadowRoot.firstChild.addEventListener("click", eventHandler, false);
+    useElement.addEventListener("click", eventHandler, false);
 
     // Should fire immediately and finish the test
     fireSimulatedMouseClickEvent(shadowRoot.firstChild);