Make ElementShadow::youngestShadowRoot() return a reference

third_party/WebKit/Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1967 matching lines @@
     }
 
     return PassRefPtrWillBeRawPtr<ShadowRoot>(ensureShadow().addShadowRoot(*this, type));
 }
 
 ShadowRoot* Element::shadowRoot() const
 {
     ElementShadow* elementShadow = shadow();
     if (!elementShadow)
         return nullptr;
-    return elementShadow->youngestShadowRoot();
+    return &elementShadow->youngestShadowRoot();
 }
 
 ShadowRoot* Element::openShadowRoot() const
 {
     ShadowRoot* root = shadowRoot();
     if (!root)
         return nullptr;
     return root->type() == ShadowRootType::V0 || root->type() == ShadowRootType::Open ? root : nullptr;
 }
 
@@ skipping 1570 matching lines @@
 {
 #if ENABLE(OILPAN)
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
 #endif
     ContainerNode::trace(visitor);
 }
 
 } // namespace blink