DevTools: Fix elements panel search in shadow host.

Source/core/inspector/InspectorDOMAgent.cpp

Index: Source/core/inspector/InspectorDOMAgent.cpp
diff --git a/Source/core/inspector/InspectorDOMAgent.cpp b/Source/core/inspector/InspectorDOMAgent.cpp
index fef89c21ad97ab4f817f397d6902b7653c75adad..54bb81bc3a4ace517d1b894c359f65c5fce9d575 100644
--- a/Source/core/inspector/InspectorDOMAgent.cpp
+++ b/Source/core/inspector/InspectorDOMAgent.cpp
@@ -984,6 +984,9 @@ static Node* nextNodeWithShadowDOMInMind(const Node& current, const Node* stayWi
             const ShadowRoot* shadowRoot = toShadowRoot(node);
             if (shadowRoot->olderShadowRoot())
                 return shadowRoot->olderShadowRoot();
+            Node* host = shadowRoot->host();
+            if (host && host->hasChildren())
+                return host->firstChild();
         }
         if (node->nextSibling())
             return node->nextSibling();