script: Use &mut JSContext in HTMLMapElement&HTMLImageElement (#43284)

I just want to be part of the campaign.

Testing: It compiles.

---------

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>
Co-authored-by: Sam <16504129+sagudev@users.noreply.github.com>

components/script/dom/html/htmlimageelement.rs

@@ -1937,9 +1937,9 @@ impl HTMLImageElementMethods<crate::DomTypeHolder> for HTMLImageElement {
     make_setter!(SetReferrerPolicy, "referrerpolicy");
 
     /// <https://html.spec.whatwg.org/multipage/#dom-img-decode>
-    fn Decode(&self, can_gc: CanGc) -> Rc<Promise> {
+    fn Decode(&self, cx: &mut JSContext) -> Rc<Promise> {
         // Step 1. Let promise be a new promise.
-        let promise = Promise::new(&self.global(), can_gc);
+        let promise = Promise::new2(cx, &self.global());
 
         // Step 2. Queue a microtask to perform the following steps:
         let task = ImageElementMicrotask::Decode {

components/script/dom/html/htmlmapelement.rs

@@ -4,6 +4,7 @@
 
 use dom_struct::dom_struct;
 use html5ever::{LocalName, Prefix};
+use js::context::JSContext;
 use js::rust::HandleObject;
 
 use crate::dom::bindings::codegen::Bindings::HTMLMapElementBinding::HTMLMapElementMethods;
@@ -67,7 +68,7 @@ impl HTMLMapElementMethods<crate::DomTypeHolder> for HTMLMapElement {
     make_atomic_setter!(SetName, "name");
 
     /// <https://html.spec.whatwg.org/multipage/#dom-map-areas>
-    fn Areas(&self, can_gc: CanGc) -> DomRoot<HTMLCollection> {
+    fn Areas(&self, cx: &mut JSContext) -> DomRoot<HTMLCollection> {
         // The areas attribute must return an HTMLCollection rooted at the map element, whose filter
         // matches only area elements.
         self.areas.or_init(|| {
@@ -75,7 +76,7 @@ impl HTMLMapElementMethods<crate::DomTypeHolder> for HTMLMapElement {
                 &self.owner_window(),
                 self.upcast(),
                 |element, _| element.is::<HTMLAreaElement>(),
-                can_gc,
+                CanGc::from_cx(cx),
             )
         })
     }

components/script_bindings/codegen/Bindings.conf

@@ -477,8 +477,7 @@ DOMInterfaces = {
 },
 
 'HTMLImageElement': {
-    'canGc': ['Decode'],
-    'cx': ['Image', 'ReportValidity', 'SetCrossOrigin'],
+    'cx': ['Decode', 'Image', 'ReportValidity', 'SetCrossOrigin'],
 },
 
 'HTMLInputElement': {
@@ -492,7 +491,7 @@ DOMInterfaces = {
 },
 
 'HTMLMapElement': {
-    'canGc': ['Areas'],
+    'cx': ['Areas'],
 },
 
 'HTMLMediaElement': {