script: Take away Fallible from new_resolved and new_rejected (#35473)

* script: Take away Fallible from new_resolved and new_rejected

Both Promise::new_resolved and new_rejected only return `Ok`. We don't
need them to be fallible. Simply return `Rc<Promise>`, instead of
`Fallible<Rc<Promise>>`. Also, clean up relevant code.

Signed-off-by: Kingsley Yung <kingsley@kkoyung.dev>

* script: pull_algorithm becomes infallible

The method pull_algorithm only returns `Some(Ok(_))`, which means it is
infallible. Clean up the returned type.

Signed-off-by: Kingsley Yung <kingsley@kkoyung.dev>

* script: generic_initialize becomes infallible

The method generic_initialize only returns `Ok(())`, which means it is
infallible. Clean up the returned type.

Signed-off-by: Kingsley Yung <kingsley@kkoyung.dev>

---------

Signed-off-by: Kingsley Yung <kingsley@kkoyung.dev>

1 files changed, 1 insertions, 7 deletions

diff --git a/components/script_bindings/codegen/CodegenRust.py b/components/script_bindings/codegen/CodegenRust.py
index 713291686af..61aa4b3d333 100644
--- a/components/script_bindings/codegen/CodegenRust.py
+++ b/components/script_bindings/codegen/CodegenRust.py
@@ -807,13 +807,7 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
                 if !JS_WrapValue(*cx, valueToResolve.handle_mut()) {
                 $*{exceptionCode}
                 }
-                match Promise::new_resolved(&promiseGlobal, cx, valueToResolve.handle()) {
-                    Ok(value) => value,
-                    Err(error) => {
-                    throw_dom_exception(cx, &promiseGlobal, error);
-                    $*{exceptionCode}
-                    }
-                }
+                Promise::new_resolved(&promiseGlobal, cx, valueToResolve.handle())
             }
             """,
             exceptionCode=exceptionCode)