Have DocumentOrderedMap API deal with AtomicString type instead of StringImpl*

Source/core/dom/TreeScope.h

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple Inc. 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
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 39 matching lines @@
 class TreeScope : public WillBeGarbageCollectedMixin {
 public:
     TreeScope* parentTreeScope() const { return m_parentTreeScope; }
 
     TreeScope* olderShadowRootOrParentTreeScope() const;
     bool isInclusiveOlderSiblingShadowRootOrAncestorTreeScopeOf(const TreeScope&) const;
 
     Element* adjustedFocusedElement() const;
     Element* getElementById(const AtomicString&) const;
     const WillBeHeapVector<RawPtrWillBeMember<Element> >& getAllElementsById(const AtomicString&) const;
-    bool hasElementWithId(StringImpl* id) const;
+    bool hasElementWithId(const AtomicString& id) const;
     bool containsMultipleElementsWithId(const AtomicString& id) const;
     void addElementById(const AtomicString& elementId, Element*);
     void removeElementById(const AtomicString& elementId, Element*);
 
     Document& document() const
     {
         ASSERT(m_document);
         return *m_document;
     }
 
@@ skipping 117 matching lines @@
     OwnPtrWillBeMember<DocumentOrderedMap> m_imageMapsByName;
     OwnPtrWillBeMember<DocumentOrderedMap> m_labelsByForAttribute;
 
     OwnPtrWillBeMember<IdTargetObserverRegistry> m_idTargetObserverRegistry;
 
     OwnPtrWillBeMember<ScopedStyleResolver> m_scopedStyleResolver;
 
     mutable RefPtrWillBeMember<DOMSelection> m_selection;
 };
 
-inline bool TreeScope::hasElementWithId(StringImpl* id) const
+inline bool TreeScope::hasElementWithId(const AtomicString& id) const
 {
-    ASSERT(id);
+    ASSERT(!id.isNull());
     return m_elementsById && m_elementsById->contains(id);
 }
 
 inline bool TreeScope::containsMultipleElementsWithId(const AtomicString& id) const
 {
-    return m_elementsById && m_elementsById->containsMultiple(id.impl());
+    return m_elementsById && m_elementsById->containsMultiple(id);
 }
 
 DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES(TreeScope)
 
 HitTestResult hitTestInDocument(const Document*, int x, int y);
 TreeScope* commonTreeScope(Node*, Node*);
 
 } // namespace blink
 
 #endif // TreeScope_h