Use TreeScope::completeURL and baseURL instead of the Document versions

Source/core/html/HTMLFormElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * 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
@@ skipping 72 matching lines @@
     document().formController()->willDeleteForm(this);
 
     for (unsigned i = 0; i < m_associatedElements.size(); ++i)
         m_associatedElements[i]->formWillBeDestroyed();
     for (unsigned i = 0; i < m_imageElements.size(); ++i)
         m_imageElements[i]->m_form = 0;
 }
 
 bool HTMLFormElement::formWouldHaveSecureSubmission(const String& url)
 {
-    return document().completeURL(url).protocolIs("https");
+    return treeScope().completeURL(url).protocolIs("https");
 }
 
 bool HTMLFormElement::rendererIsNeeded(const RenderStyle& style)
 {
     if (!m_wasDemoted)
         return HTMLElement::rendererIsNeeded(style);
 
     ContainerNode* node = parentNode();
     RenderObject* parentRenderer = node->renderer();
     // FIXME: Shouldn't we also check for table caption (see |formIsTablePart| below).
@@ skipping 716 matching lines @@
 }
 
 void HTMLFormElement::setDemoted(bool demoted)
 {
     if (demoted)
         UseCounter::count(document(), UseCounter::DemotedFormElement);
     m_wasDemoted = demoted;
 }
 
 } // namespace