Have Node::document() return a reference instead of a pointer

Source/web/WebSearchableFormData.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 47 matching lines @@
 {
     String str(form->getAttribute(HTMLNames::accept_charsetAttr));
     str.replace(',', ' ');
     Vector<String> charsets;
     str.split(' ', charsets);
     for (Vector<String>::const_iterator i(charsets.begin()); i != charsets.end(); ++i) {
         *encoding = WTF::TextEncoding(*i);
         if (encoding->isValid())
             return;
     }
-    if (!form->document()->loader())
+    if (!form->document().loader())
          return;
-    *encoding = WTF::TextEncoding(form->document()->encoding());
+    *encoding = WTF::TextEncoding(form->document().encoding());
 }
 
 // Returns true if the submit request results in an HTTP URL.
 bool IsHTTPFormSubmit(const HTMLFormElement* form)
 {
     // FIXME: This function is insane. This is an overly complicated way to get this information.
     String action(form->action());
     // The isNull() check is trying to avoid completeURL returning KURL() when passed a null string.
-    return form->document()->completeURL(action.isNull() ? "" : action).protocolIs("http");
+    return form->document().completeURL(action.isNull() ? "" : action).protocolIs("http");
 }
 
 // If the form does not have an activated submit button, the first submit
 // button is returned.
 HTMLFormControlElement* GetButtonToActivate(HTMLFormElement* form)
 {
     HTMLFormControlElement* firstSubmitButton = 0;
     // FIXME: Consider refactoring this code so that we don't call form->associatedElements() twice.
     for (Vector<FormAssociatedElement*>::const_iterator i(form->associatedElements().begin()); i != form->associatedElements().end(); ++i) {
         if (!(*i)->isFormControlElement())
@@ skipping 193 matching lines @@
     bool isValidSearchString = buildSearchString(formElement.get(), &encodedString, &encoding, inputElement);
 
     if (firstSubmitButton)
         firstSubmitButton->setActivatedSubmit(false);
 
     // Return if the search string is not valid.
     if (!isValidSearchString)
         return;
 
     String action(formElement->action());
-    KURL url(formElement->document()->completeURL(action.isNull() ? "" : action));
+    KURL url(formElement->document().completeURL(action.isNull() ? "" : action));
     RefPtr<FormData> formData = FormData::create(encodedString);
     url.setQuery(formData->flattenToString());
     m_url = url;
     m_encoding = String(encoding.name());
 }
 
 } // namespace WebKit