Stop implementing Copy for JS<T>.

A copy of a JS<T> doesn't have the rooting properties of the original,
so it makes no sense for it to implement Copy.

1 files changed, 5 insertions, 5 deletions

diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs
index f5a3569da13..cae331679a9 100644
--- a/components/script/dom/webglrenderingcontext.rs
+++ b/components/script/dom/webglrenderingcontext.rs
@@ -12,7 +12,7 @@ use dom::bindings::codegen::InheritTypes::{EventCast, EventTargetCast, NodeCast}
 use dom::bindings::codegen::UnionTypes::ImageDataOrHTMLImageElementOrHTMLCanvasElementOrHTMLVideoElement;
 use dom::bindings::conversions::ToJSValConvertible;
 use dom::bindings::global::{GlobalField, GlobalRef};
-use dom::bindings::js::{JS, LayoutJS, Root};
+use dom::bindings::js::{JS, LayoutJS, MutNullableHeap, Root};
 use dom::bindings::utils::{Reflector, reflect_dom_object};
 use dom::event::{EventBubbles, EventCancelable};
 use dom::htmlcanvaselement::HTMLCanvasElement;
@@ -78,8 +78,8 @@ pub struct WebGLRenderingContext {
     canvas: JS<HTMLCanvasElement>,
     last_error: Cell<Option<WebGLError>>,
     texture_unpacking_settings: Cell<TextureUnpacking>,
-    bound_texture_2d: Cell<Option<JS<WebGLTexture>>>,
-    bound_texture_cube_map: Cell<Option<JS<WebGLTexture>>>,
+    bound_texture_2d: MutNullableHeap<JS<WebGLTexture>>,
+    bound_texture_cube_map: MutNullableHeap<JS<WebGLTexture>>,
 }
 
 impl WebGLRenderingContext {
@@ -104,8 +104,8 @@ impl WebGLRenderingContext {
                 canvas: JS::from_ref(canvas),
                 last_error: Cell::new(None),
                 texture_unpacking_settings: Cell::new(CONVERT_COLORSPACE),
-                bound_texture_2d: Cell::new(None),
-                bound_texture_cube_map: Cell::new(None),
+                bound_texture_2d: MutNullableHeap::new(None),
+                bound_texture_cube_map: MutNullableHeap::new(None),
             }
         })
     }