Auto merge of #11192 - perlun:remove-unused-imports, r=Manishearth

Removed unused imports

- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #11185
- [X] These changes do not require tests because it only removes dead code.

----

This fixes #11185.

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/11192)
<!-- Reviewable:end -->

1 files changed, 1 insertions, 3 deletions

diff --git a/components/script/dom/htmlscriptelement.rs b/components/script/dom/htmlscriptelement.rs
index 67b959dfe77..3ba0b240e31 100644
--- a/components/script/dom/htmlscriptelement.rs
+++ b/components/script/dom/htmlscriptelement.rs
@@ -15,7 +15,6 @@ use dom::bindings::inheritance::Castable;
 use dom::bindings::js::RootedReference;
 use dom::bindings::js::{JS, Root};
 use dom::bindings::refcounted::Trusted;
-use dom::bindings::trace::JSTraceable;
 use dom::document::Document;
 use dom::element::{AttributeMutation, Element, ElementCreator};
 use dom::event::{Event, EventBubbles, EventCancelable};
@@ -26,7 +25,7 @@ use dom::node::{document_from_node, window_from_node};
 use dom::virtualmethods::VirtualMethods;
 use dom::window::ScriptHelpers;
 use encoding::label::encoding_from_whatwg_label;
-use encoding::types::{DecoderTrap, Encoding, EncodingRef};
+use encoding::types::{DecoderTrap, EncodingRef};
 use html5ever::tree_builder::NextParserState;
 use hyper::http::RawStatus;
 use ipc_channel::ipc;
@@ -35,7 +34,6 @@ use js::jsapi::RootedValue;
 use js::jsval::UndefinedValue;
 use net_traits::{AsyncResponseListener, AsyncResponseTarget, Metadata, NetworkError};
 use network_listener::{NetworkListener, PreInvoke};
-use script_runtime::ScriptChan;
 use std::ascii::AsciiExt;
 use std::cell::Cell;
 use std::mem;