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

Source/web/WebPasswordFormData.cpp

Index: Source/web/WebPasswordFormData.cpp
diff --git a/Source/web/WebPasswordFormData.cpp b/Source/web/WebPasswordFormData.cpp
index c3aba9ae1ff85e59869caa238204a44a8e0ecb28..5583dfc1dfff49f6923cd5fe61e3ead66a8ab69c 100644
--- a/Source/web/WebPasswordFormData.cpp
+++ b/Source/web/WebPasswordFormData.cpp
@@ -157,13 +157,13 @@ WebPasswordFormData::WebPasswordFormData(const WebFormElement& webForm)
     findPasswordFormFields(form.get(), &fields);
 
     // Get the document URL
-    KURL fullOrigin(ParsedURLString, form->document()->documentURI());
+    KURL fullOrigin(ParsedURLString, form->document().documentURI());
 
     // Calculate the canonical action URL
     String action = form->action();
     if (action.isNull())
         action = ""; // missing 'action' attribute implies current URL
-    KURL fullAction = form->document()->completeURL(action);
+    KURL fullAction = form->document().completeURL(action);
     if (!fullAction.isValid())
         return;