Use the composed tree for the title attributes in Shadow DOM

Source/core/layout/HitTestResult.cpp

Index: Source/core/layout/HitTestResult.cpp
diff --git a/Source/core/layout/HitTestResult.cpp b/Source/core/layout/HitTestResult.cpp
index e7242e52c132a7c11c14defd691470c8440b158d..865a6a023faefdd87633e51826361355795e9dc3 100644
--- a/Source/core/layout/HitTestResult.cpp
+++ b/Source/core/layout/HitTestResult.cpp
@@ -25,6 +25,7 @@
 #include "core/HTMLNames.h"
 #include "core/dom/DocumentMarkerController.h"
 #include "core/dom/NodeRenderingTraversal.h"
+#include "core/dom/shadow/ComposedTreeTraversal.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/editing/FrameSelection.h"
 #include "core/fetch/ImageResource.h"
@@ -220,7 +221,7 @@ String HitTestResult::title(TextDirection& dir) const
     dir = LTR;
     // Find the title in the nearest enclosing DOM node.
     // For <area> tags in image maps, walk the tree for the <area>, not the <img> using it.
-    for (Node* titleNode = m_innerNode.get(); titleNode; titleNode = titleNode->parentNode()) {
+    for (Node* titleNode = m_innerNode.get(); titleNode; titleNode = ComposedTreeTraversal::parent(*titleNode)) {
         if (titleNode->isElementNode()) {
             String title = toElement(titleNode)->title();
             if (!title.isNull()) {