Update HTTPHeaderMap wrappers to use AtomicString type for header values

Source/core/history/HistoryItem.cpp

 /*
  * Copyright (C) 2005, 2006, 2008, 2011 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 68 matching lines @@
 
 PassRefPtr<HistoryItem> HistoryItem::copy() const
 {
     return adoptRef(new HistoryItem(*this));
 }
 
 void HistoryItem::reset()
 {
     m_urlString = String();
     m_originalURLString = String();
-    m_referrer = String();
+    m_referrer = nullAtom;
     m_target = String();
     m_itemSequenceNumber = generateSequenceNumber();
     m_stateObject = 0;
     m_documentSequenceNumber = generateSequenceNumber();
     m_targetFrameID = 0;
     m_formData = 0;
-    m_formContentType = String();
+    m_formContentType = nullAtom;
     clearChildren();
 }
 
 const String& HistoryItem::urlString() const
 {
     return m_urlString;
 }
 
 // The first URL we loaded to get to where this history item points.  Includes both client
 // and server redirects.
 const String& HistoryItem::originalURLString() const
 {
     return m_originalURLString;
 }
 
 KURL HistoryItem::url() const
 {
     return KURL(ParsedURLString, m_urlString);
 }
 
 KURL HistoryItem::originalURL() const
 {
     return KURL(ParsedURLString, m_originalURLString);
 }
 
-const String& HistoryItem::referrer() const
+const AtomicString& HistoryItem::referrer() const
 {
     return m_referrer;
 }
 
 const String& HistoryItem::target() const
 {
     return m_target;
 }
 
 void HistoryItem::setURLString(const String& urlString)
 {
     if (m_urlString != urlString)
         m_urlString = urlString;
 }
 
 void HistoryItem::setURL(const KURL& url)
 {
     setURLString(url.string());
     clearDocumentState();
 }
 
 void HistoryItem::setOriginalURLString(const String& urlString)
 {
     m_originalURLString = urlString;
 }
 
-void HistoryItem::setReferrer(const String& referrer)
+void HistoryItem::setReferrer(const AtomicString& referrer)
 {
     m_referrer = referrer;
 }
 
 void HistoryItem::setTarget(const String& target)
 {
     m_target = target;
 }
 
 const IntPoint& HistoryItem::scrollPoint() const
@@ skipping 50 matching lines @@
 const HistoryItemVector& HistoryItem::children() const
 {
     return m_children;
 }
 
 void HistoryItem::clearChildren()
 {
     m_children.clear();
 }
 
-String HistoryItem::formContentType() const
+const AtomicString& HistoryItem::formContentType() const
 {
     return m_formContentType;
 }
 
 void HistoryItem::setFormInfoFromRequest(const ResourceRequest& request)
 {
     m_referrer = request.httpReferrer();
 
     if (equalIgnoringCase(request.httpMethod(), "POST")) {
         // FIXME: Eventually we have to make this smart enough to handle the case where
         // we have a stream for the body to handle the "data interspersed with files" feature.
         m_formData = request.httpBody();
         m_formContentType = request.httpContentType();
     } else {
         m_formData = 0;
-        m_formContentType = String();
+        m_formContentType = nullAtom;
     }
 }
 
 void HistoryItem::setFormData(PassRefPtr<FormData> formData)
 {
     m_formData = formData;
 }
 
-void HistoryItem::setFormContentType(const String& formContentType)
+void HistoryItem::setFormContentType(const AtomicString& formContentType)
 {
     m_formContentType = formContentType;
 }
 
 FormData* HistoryItem::formData()
 {
     return m_formData.get();
 }
 
 bool HistoryItem::isCurrentDocument(Document* doc) const
 {
     // FIXME: We should find a better way to check if this is the current document.
     return equalIgnoringFragmentIdentifier(url(), doc->url());
 }
 
 } // namespace WebCore