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

Source/core/loader/FormSubmission.cpp

 /*
  * Copyright (C) 2010 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 144 matching lines @@
         if (!(attributeValue = submitButton->getAttribute(formactionAttr)).isNull())
             copiedAttributes.parseAction(attributeValue);
         if (!(attributeValue = submitButton->getAttribute(formenctypeAttr)).isNull())
             copiedAttributes.updateEncodingType(attributeValue);
         if (!(attributeValue = submitButton->getAttribute(formmethodAttr)).isNull())
             copiedAttributes.updateMethodType(attributeValue);
         if (!(attributeValue = submitButton->getAttribute(formtargetAttr)).isNull())
             copiedAttributes.setTarget(attributeValue);
     }
 
-    Document* document = form->document();
-    KURL actionURL = document->completeURL(copiedAttributes.action().isEmpty() ? document->url().string() : copiedAttributes.action());
+    Document& document = form->document();
+    KURL actionURL = document.completeURL(copiedAttributes.action().isEmpty() ? document.url().string() : copiedAttributes.action());
     bool isMailtoForm = actionURL.protocolIs("mailto");
     bool isMultiPartForm = false;
     String encodingType = copiedAttributes.encodingType();
 
     if (copiedAttributes.method() == PostMethod) {
         isMultiPartForm = copiedAttributes.isMultiPartForm();
         if (isMultiPartForm && isMailtoForm) {
             encodingType = "application/x-www-form-urlencoded";
             isMultiPartForm = false;
         }
     }
 
-    WTF::TextEncoding dataEncoding = isMailtoForm ? UTF8Encoding() : FormDataBuilder::encodingFromAcceptCharset(copiedAttributes.acceptCharset(), document);
+    WTF::TextEncoding dataEncoding = isMailtoForm ? UTF8Encoding() : FormDataBuilder::encodingFromAcceptCharset(copiedAttributes.acceptCharset(), &document);
     RefPtr<DOMFormData> domFormData = DOMFormData::create(dataEncoding.encodingForFormSubmission());
     Vector<pair<String, String> > formValues;
 
     bool containsPasswordData = false;
     for (unsigned i = 0; i < form->associatedElements().size(); ++i) {
         FormAssociatedElement* control = form->associatedElements()[i];
         HTMLElement* element = toHTMLElement(control);
         if (!element->isDisabledFormControl())
             control->appendFormData(*domFormData, isMultiPartForm);
         if (element->hasTagName(inputTag)) {
             HTMLInputElement* input = toHTMLInputElement(element);
             if (input->isTextField())
                 formValues.append(pair<String, String>(input->name().string(), input->value()));
             if (input->isPasswordField() && !input->value().isEmpty())
                 containsPasswordData = true;
         }
     }
 
     RefPtr<FormData> formData;
     String boundary;
 
     if (isMultiPartForm) {
-        formData = FormData::createMultiPart(*(static_cast<FormDataList*>(domFormData.get())), domFormData->encoding(), document);
+        formData = FormData::createMultiPart(*(static_cast<FormDataList*>(domFormData.get())), domFormData->encoding(), &document);
         boundary = formData->boundary().data();
     } else {
         formData = FormData::create(*(static_cast<FormDataList*>(domFormData.get())), domFormData->encoding(), attributes.method() == GetMethod ? FormData::FormURLEncoded : FormData::parseEncodingType(encodingType));
         if (copiedAttributes.method() == PostMethod && isMailtoForm) {
             // Convert the form data into a string that we put into the URL.
             appendMailtoPostFormDataToURL(actionURL, *formData, encodingType);
             formData = FormData::create();
         }
     }
 
     formData->setIdentifier(generateFormDataIdentifier());
     formData->setContainsPasswordData(containsPasswordData);
-    String targetOrBaseTarget = copiedAttributes.target().isEmpty() ? document->baseTarget() : copiedAttributes.target();
-    RefPtr<FormState> formState = FormState::create(form, formValues, document, trigger);
+    String targetOrBaseTarget = copiedAttributes.target().isEmpty() ? document.baseTarget() : copiedAttributes.target();
+    RefPtr<FormState> formState = FormState::create(form, formValues, &document, trigger);
     return adoptRef(new FormSubmission(copiedAttributes.method(), actionURL, targetOrBaseTarget, encodingType, formState.release(), formData.release(), boundary, event));
 }
 
 KURL FormSubmission::requestURL() const
 {
     if (m_method == FormSubmission::PostMethod)
         return m_action;
 
     KURL requestURL(m_action);
     requestURL.setQuery(m_formData->flattenToString());
@@ skipping 17 matching lines @@
             frameRequest.resourceRequest().setHTTPContentType(m_contentType);
         else
             frameRequest.resourceRequest().setHTTPContentType(m_contentType + "; boundary=" + m_boundary);
     }
 
     frameRequest.resourceRequest().setURL(requestURL());
     FrameLoader::addHTTPOriginIfNeeded(frameRequest.resourceRequest(), m_origin);
 }
 
 }