Remove code to support Objective-C bindings

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index fc57db7026df9aa5ce63971007866fbc11f705d6..85722ba2b4125ed6dec936aef7ff505225beba29 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -371,7 +371,6 @@ public:
     void setHasXMLDeclaration(bool hasXMLDeclaration) { m_hasXMLDeclaration = hasXMLDeclaration ? 1 : 0; }
 
     String documentURI() const { return m_documentURI; }
-    void setDocumentURI(const String&);
 
     virtual KURL baseURI() const;
 
@@ -1233,8 +1232,6 @@ private:
     // string by content.  Document.documentURI affects m_baseURL unless the
     // document contains a <base> element, in which case the <base> element
     // takes precedence.
-    //
-    // This property is read-only from JavaScript, but writable from Objective C.
     String m_documentURI;
 
     String m_baseTarget;