Fix for crash occuring when spatial navigation is enabled

Source/core/page/SpatialNavigation.cpp

Index: Source/core/page/SpatialNavigation.cpp
diff --git a/Source/core/page/SpatialNavigation.cpp b/Source/core/page/SpatialNavigation.cpp
index cb014f916c282beaef9813d6078bd17a04fbcadd..7e62a60271dd9970cc2f16e692814cd5c3dee36c 100644
--- a/Source/core/page/SpatialNavigation.cpp
+++ b/Source/core/page/SpatialNavigation.cpp
@@ -439,7 +439,7 @@ Node* scrollableEnclosingBoxOrParentFrameForNodeInDirection(FocusDirection direc
         if (parent->isDocumentNode())
             parent = toDocument(parent)->document()->frame()->ownerElement();
         else
-            parent = parent->parentNode();
+            parent = parent->parentOrShadowHostNode();
     } while (parent && !canScrollInDirection(parent, direction) && !parent->isDocumentNode());
 
     return parent;