XMLTreeViewer should be created only in the XML viewer mode

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 30 matching lines @@
 
 using namespace std;
 
 namespace WebCore {
 
 XMLTreeViewer::XMLTreeViewer(Document* document)
     : m_document(document)
 {
 }
 
-bool XMLTreeViewer::hasNoStyleInformation() const
-{
-    if (m_document->sawElementsInKnownNamespaces() || m_document->transformSourceDocument())
-        return false;
-
-    if (!m_document->frame() || !m_document->frame()->page())
-        return false;
-
-    if (m_document->frame()->tree()->parent())
-        return false; // This document is not in a top frame
-
-    return true;
-}
-
 void XMLTreeViewer::transformDocumentToTreeView()
 {
     m_document->setIsViewSource(true);
     String scriptString(reinterpret_cast<const char*>(XMLViewer_js), sizeof(XMLViewer_js));
     m_document->frame()->script()->executeScriptInMainWorld(ScriptSourceCode(scriptString));
     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(ScriptSourceCode("prepareWebKitXMLViewer('" + noStyleMessage + "');"));
 
     String cssString(reinterpret_cast<const char*>(XMLViewer_css), sizeof(XMLViewer_css));
     RefPtr<Text> text = m_document->createTextNode(cssString);
     m_document->getElementById("xml-viewer-style")->appendChild(text, IGNORE_EXCEPTION, AttachLazily);
 }
 
 } // namespace WebCore