Drop editing's createFullMarkup() function

Source/core/editing/markup.cpp

Index: Source/core/editing/markup.cpp
diff --git a/Source/core/editing/markup.cpp b/Source/core/editing/markup.cpp
index de075c6286511c3c46a1e6987fa3dee1b5e5df46..86f6660cb5a5dae4f9b9da625f9c2bfd14f32c6b 100644
--- a/Source/core/editing/markup.cpp
+++ b/Source/core/editing/markup.cpp
@@ -903,23 +903,6 @@ PassRefPtrWillBeRawPtr<DocumentFragment> createFragmentFromText(Range* context,
     return fragment.release();
 }
 
-String createFullMarkup(const Node* node)
-{
-    if (!node)
-        return String();
-
-    LocalFrame* frame = node->document().frame();
-    if (!frame)
-        return String();
-
-    // FIXME: This is never "for interchange". Is that right?
-    String markupString = createMarkup(node, IncludeNode, 0);
-    if (!node->isDocumentNode() && !node->isDocumentTypeNode())
-        markupString = frame->documentTypeString() + markupString;
-
-    return markupString;
-}
-
 String urlToMarkup(const KURL& url, const String& title)
 {
     StringBuilder markup;