Make calls to AtomicString(const String&) explicit in web/

Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 520 matching lines @@
 
     const KURL& url() const { return m_url; }
     void setURL(const KURL&);
 
     // To understand how these concepts relate to one another, please see the
     // comments surrounding their declaration.
     const KURL& baseURL() const { return m_baseURL; }
     void setBaseURLOverride(const KURL&);
     const KURL& baseURLOverride() const { return m_baseURLOverride; }
     const KURL& baseElementURL() const { return m_baseElementURL; }
-    const String& baseTarget() const { return m_baseTarget; }
+    const AtomicString& baseTarget() const { return m_baseTarget; }
     void processBaseElement();
 
     KURL completeURL(const String&) const;
     KURL completeURL(const String&, const KURL& baseURLOverride) const;
 
     virtual String userAgent(const KURL&) const;
     virtual void disableEval(const String& errorMessage);
 
     bool canNavigate(Frame* targetFrame);
     Frame* findUnsafeParentScrollPropagationBoundary();
@@ skipping 573 matching lines @@
     KURL m_baseElementURL; // The URL set by the <base> element.
     KURL m_cookieURL; // The URL to use for cookie access.
 
     // Document.documentURI:
     // Although URL-like, Document.documentURI can actually be set to any
     // string by content.  Document.documentURI affects m_baseURL unless the
     // document contains a <base> element, in which case the <base> element
     // takes precedence.
     String m_documentURI;
 
-    String m_baseTarget;
+    AtomicString m_baseTarget;
 
     RefPtr<DocumentType> m_docType;
     OwnPtr<DOMImplementation> m_implementation;
 
     RefPtr<CSSStyleSheet> m_elemSheet;
 
     bool m_printing;
     bool m_paginatedForScreen;
 
     CompatibilityMode m_compatibilityMode;
@@ skipping 208 matching lines @@
 inline bool Node::isDocumentNode() const
 {
     return this == documentInternal();
 }
 
 Node* eventTargetNodeForDocument(Document*);
 
 } // namespace WebCore
 
 #endif // Document_h