Fix reported test-tidy errors for unmerged import blocks

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

components/script/dom/htmltablesectionelement.rs

@@ -2,6 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+use cssparser::RGBA;
 use dom::attr::Attr;
 use dom::bindings::codegen::Bindings::HTMLTableSectionElementBinding;
 use dom::bindings::codegen::InheritTypes::{HTMLElementCast, HTMLTableSectionElementDerived};
@@ -12,8 +13,6 @@ use dom::eventtarget::{EventTarget, EventTargetTypeId};
 use dom::htmlelement::{HTMLElement, HTMLElementTypeId};
 use dom::node::{Node, NodeTypeId};
 use dom::virtualmethods::VirtualMethods;
-
-use cssparser::RGBA;
 use std::cell::Cell;
 use util::str::{self, DOMString};