Fix reported test-tidy errors for unmerged import blocks

This merges import blocks that were reported by tidy as unmerged.

components/script/layout_interface.rs

@@ -7,7 +7,6 @@
 //! the DOM to be placed in a separate crate from layout.
 
 use dom::node::LayoutData;
-
 use euclid::point::Point2D;
 use euclid::rect::Rect;
 use ipc_channel::ipc::{IpcReceiver, IpcSender};