Make ElementShadow::youngestShadowRoot() return a reference

third_party/WebKit/Source/core/inspector/InspectorDOMAgent.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 895 matching lines @@
     m_domEditor->replaceWholeText(toText(node), value, errorString);
 }
 
 static Node* nextNodeWithShadowDOMInMind(const Node& current, const Node* stayWithin, bool includeUserAgentShadowDOM)
 {
     // At first traverse the subtree.
     if (current.isElementNode()) {
         const Element& element = toElement(current);
         ElementShadow* elementShadow = element.shadow();
         if (elementShadow) {
-            ShadowRoot* shadowRoot = elementShadow->youngestShadowRoot();
-            if (shadowRoot) {
-                if (shadowRoot->type() != ShadowRootType::UserAgent || includeUserAgentShadowDOM)
-                    return shadowRoot;
-            }
+            ShadowRoot& shadowRoot = elementShadow->youngestShadowRoot();
+            if (shadowRoot.type() != ShadowRootType::UserAgent || includeUserAgentShadowDOM)
+                return &shadowRoot;
+
         }
     }
     if (current.hasChildren())
         return current.firstChild();
 
     // Then traverse siblings of the node itself and its ancestors.
     const Node* node = &current;
     do {
         if (node == stayWithin)
             return nullptr;
@@ skipping 600 matching lines @@
             HTMLFrameOwnerElement* frameOwner = toHTMLFrameOwnerElement(node);
             if (LocalFrame* frame = frameOwner->contentFrame() && frameOwner->contentFrame()->isLocalFrame() ? toLocalFrame(frameOwner->contentFrame()) : nullptr)
                 value->setFrameId(IdentifiersFactory::frameId(frame));
             if (Document* doc = frameOwner->contentDocument())
                 value->setContentDocument(buildObjectForNode(doc, 0, nodesMap));
         }
 
         ElementShadow* shadow = element->shadow();
         if (shadow) {
             RefPtr<TypeBuilder::Array<TypeBuilder::DOM::Node> > shadowRoots = TypeBuilder::Array<TypeBuilder::DOM::Node>::create();
-            for (ShadowRoot* root = shadow->youngestShadowRoot(); root; root = root->olderShadowRoot())
+            for (ShadowRoot* root = &shadow->youngestShadowRoot(); root; root = root->olderShadowRoot())
                 shadowRoots->addItem(buildObjectForNode(root, 0, nodesMap));
             value->setShadowRoots(shadowRoots);
             forcePushChildren = true;
         }
 
         if (isHTMLLinkElement(*element)) {
             HTMLLinkElement& linkElement = toHTMLLinkElement(*element);
             if (linkElement.isImport() && linkElement.import() && innerParentNode(linkElement.import()) == linkElement)
                 value->setImportedDocument(buildObjectForNode(linkElement.import(), 0, nodesMap));
             forcePushChildren = true;
@@ skipping 599 matching lines @@
     visitor->trace(m_document);
     visitor->trace(m_revalidateTask);
     visitor->trace(m_searchResults);
 #endif
     visitor->trace(m_history);
     visitor->trace(m_domEditor);
     InspectorBaseAgent::trace(visitor);
 }
 
 } // namespace blink