Revert "Bug 42378: Apply spoof English to the default detail summary."

This reverts commit bdfc4f4c.

dom/html/HTMLDetailsElement.cpp

@@ -105,9 +105,8 @@ void HTMLDetailsElement::SetupShadowTree() {
     }
 
     nsAutoString defaultSummaryText;
-    nsContentUtils::GetMaybeLocalizedString(nsContentUtils::eFORMS_PROPERTIES,
-                                            "DefaultSummary", OwnerDoc(),
-                                            defaultSummaryText);
+    nsContentUtils::GetLocalizedString(nsContentUtils::eFORMS_PROPERTIES,
+                                       "DefaultSummary", defaultSummaryText);
     RefPtr<nsTextNode> description = new (nim) nsTextNode(nim);
     description->SetText(defaultSummaryText, kNotify);
     summary->AppendChildTo(description, kNotify, IgnoreErrors());