Make ElementShadow::youngestShadowRoot() return a reference

third_party/WebKit/Source/core/editing/serializers/StyledMarkupSerializer.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009, 2010, 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011 Igalia S.L.
  * Copyright (C) 2011 Motorola Mobility. All rights reserved.
  *
  * 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 59 matching lines @@
 }
 
 template<>
 bool handleSelectionBoundary<EditingInComposedTreeStrategy>(const Node& node)
 {
     if (!node.isElementNode())
         return false;
     ElementShadow* shadow = toElement(node).shadow();
     if (!shadow)
         return false;
-    return shadow->youngestShadowRoot()->type() == ShadowRootType::UserAgent;
+    return shadow->youngestShadowRoot().type() == ShadowRootType::UserAgent;
 }
 
 } // namespace
 
 using namespace HTMLNames;
 
 template<typename Strategy>
 class StyledMarkupTraverser {
     WTF_MAKE_NONCOPYABLE(StyledMarkupTraverser);
     STACK_ALLOCATED();
@@ skipping 384 matching lines @@
     if (element.isHTMLElement() && shouldAnnotate())
         inlineStyle->mergeStyleFromRulesForSerialization(&toHTMLElement(element));
 
     return inlineStyle;
 }
 
 template class StyledMarkupSerializer<EditingStrategy>;
 template class StyledMarkupSerializer<EditingInComposedTreeStrategy>;
 
 } // namespace blink