diff -r 000000000000 -r 6474c204b198 dom/xslt/xml/txXMLParser.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/xslt/xml/txXMLParser.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,54 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "txXMLParser.h"
+#include "txURIUtils.h"
+#include "txXPathTreeWalker.h"
+
+#include "nsIDocument.h"
+#include "nsIDOMDocument.h"
+#include "nsSyncLoadService.h"
+#include "nsNetUtil.h"
+#include "nsIPrincipal.h"
+
+nsresult
+txParseDocumentFromURI(const nsAString& aHref, const txXPathNode& aLoader,
+                       nsAString& aErrMsg, txXPathNode** aResult)
+{
+    NS_ENSURE_ARG_POINTER(aResult);
+    *aResult = nullptr;
+    nsCOMPtr<nsIURI> documentURI;
+    nsresult rv = NS_NewURI(getter_AddRefs(documentURI), aHref);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsIDocument* loaderDocument = txXPathNativeNode::getDocument(aLoader);
+
+    nsCOMPtr<nsILoadGroup> loadGroup = loaderDocument->GetDocumentLoadGroup();
+
+    // For the system principal loaderUri will be null here, which is good
+    // since that means that chrome documents can load any uri.
+
+    // Raw pointer, we want the resulting txXPathNode to hold a reference to
+    // the document.
+    nsIDOMDocument* theDocument = nullptr;
+    nsAutoSyncOperation sync(loaderDocument);
+    rv = nsSyncLoadService::LoadDocument(documentURI,
+                                         loaderDocument->NodePrincipal(),
+                                         loadGroup, true, &theDocument);
+
+    if (NS_FAILED(rv)) {
+        aErrMsg.Append(NS_LITERAL_STRING("Document load of ") + 
+                       aHref + NS_LITERAL_STRING(" failed."));
+        return NS_FAILED(rv) ? rv : NS_ERROR_FAILURE;
+    }
+
+    *aResult = txXPathNativeNode::createXPathNode(theDocument);
+    if (!*aResult) {
+        NS_RELEASE(theDocument);
+        return NS_ERROR_FAILURE;
+    }
+
+    return NS_OK;
+}