Move 'dir' attribute from HTMLDocument to Document.

Source/core/html/HTMLDocument.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 61 matching lines @@
     : Document(initializer, HTMLDocumentClass | extendedDocumentClasses)
 {
     ScriptWrappable::init(this);
     clearXMLVersion();
 }
 
 HTMLDocument::~HTMLDocument()
 {
 }
 
-const AtomicString& HTMLDocument::dir()
-{
-    HTMLElement* b = body();
-    if (!b)
-        return nullAtom;
-    return b->getAttribute(dirAttr);
-}
-
-void HTMLDocument::setDir(const AtomicString& value)
-{
-    HTMLElement* b = body();
-    if (b)
-        b->setAttribute(dirAttr, value);
-}
-
 String HTMLDocument::designMode() const
 {
     return inDesignMode() ? "on" : "off";
 }
 
 void HTMLDocument::setDesignMode(const String& value)
 {
     InheritedBool mode;
     if (equalIgnoringCase(value, "on"))
         mode = on;
@@ skipping 205 matching lines @@
 void HTMLDocument::writeln(DOMWindow* callingWindow, const Vector<String>& text)
 {
     ASSERT(callingWindow);
     StringBuilder builder;
     for (size_t i = 0; i < text.size(); ++i)
         builder.append(text[i]);
     writeln(builder.toString(), callingWindow->document());
 }
 
 }