Revert of Removing "using" declarations that import names in the C++ Standard library.

Source/core/xml/XMLTreeViewer.cpp

 /*
  * Copyright (C) 2011 Google 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.
  *
@@ skipping 21 matching lines @@
 #include "XMLViewerCSS.h"
 #include "XMLViewerJS.h"
 #include "bindings/v8/ExceptionStatePlaceholder.h"
 #include "bindings/v8/ScriptController.h"
 #include "bindings/v8/ScriptSourceCode.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/Text.h"
 #include "core/frame/LocalFrame.h"
 
+using namespace std;
+
 namespace WebCore {
 
 XMLTreeViewer::XMLTreeViewer(Document* document)
     : m_document(document)
 {
 }
 
 void XMLTreeViewer::transformDocumentToTreeView()
 {
     m_document->setIsViewSource(true);
     String scriptString(reinterpret_cast<const char*>(XMLViewer_js), sizeof(XMLViewer_js));
     m_document->frame()->script().executeScriptInMainWorld(scriptString, ScriptController::ExecuteScriptWhenScriptsDisabled);
     String noStyleMessage("This XML file does not appear to have any style information associated with it. The document tree is shown below.");
     m_document->frame()->script().executeScriptInMainWorld("prepareWebKitXMLViewer('" + noStyleMessage + "');", ScriptController::ExecuteScriptWhenScriptsDisabled);
 
     String cssString(reinterpret_cast<const char*>(XMLViewer_css), sizeof(XMLViewer_css));
     m_document->getElementById("xml-viewer-style")->appendChild(m_document->createTextNode(cssString), IGNORE_EXCEPTION);
 }
 
 } // namespace WebCore