XMLTreeViewer should be created only in the XML viewer mode

Source/core/xml/XMLTreeViewer.cpp

Index: Source/core/xml/XMLTreeViewer.cpp
diff --git a/Source/core/xml/XMLTreeViewer.cpp b/Source/core/xml/XMLTreeViewer.cpp
index 4c9109b8c947db72d27075b3c0c61bdc0dab3b57..c8ce86e0bdee3e895b030950d8baa38d1b45446d 100644
--- a/Source/core/xml/XMLTreeViewer.cpp
+++ b/Source/core/xml/XMLTreeViewer.cpp
@@ -48,20 +48,6 @@ XMLTreeViewer::XMLTreeViewer(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);