order derivable traits lists

Ignoring :
 - **generated**.rs
 - python/tidy/servo_tidy_tests/rust_tidy.rs

components/script/dom/servoparser/async_html.rs

@@ -495,7 +495,7 @@ fn run(sink: Sink,
     }
 }
 
-#[derive(JSTraceable, HeapSizeOf, Default)]
+#[derive(Default, HeapSizeOf, JSTraceable)]
 struct ParseNodeData {
     contents: Option<ParseNode>,
     is_integration_point: bool,

components/script/dom/servoparser/mod.rs

@@ -738,7 +738,7 @@ fn insert(parent: &Node, reference_child: Option<&Node>, child: NodeOrText<JS<No
     }
 }
 
-#[derive(JSTraceable, HeapSizeOf)]
+#[derive(HeapSizeOf, JSTraceable)]
 #[must_root]
 pub struct Sink {
     base_url: ServoUrl,