No bug - trivial TopLevelRuleParser construction cleanup. r=me

MozReview-Commit-ID: 5CdOdQPZzyb

servo/components/style/stylesheets/stylesheet.rs

@@ -363,13 +363,13 @@ impl Stylesheet {
 
         let rule_parser = TopLevelRuleParser {
             stylesheet_origin: origin,
-            shared_lock: shared_lock,
+            shared_lock,
             loader: stylesheet_loader,
-            context: context,
-            error_context: error_context,
+            context,
+            error_context,
             state: State::Start,
             had_hierarchy_error: false,
-            namespaces: namespaces,
+            namespaces,
         };
 
         {