Remove support for scoped static methods

This is intended to address #834 where we don't actually want methods scoped
like this! Instead we'll provide one unique accessor for the `window` object
itself.

crates/shared/src/lib.rs

@@ -51,7 +51,7 @@ pub struct ImportFunction {
 
 #[derive(Deserialize, Serialize)]
 pub struct MethodData {
-    pub class: Option<String>,
+    pub class: String,
     pub kind: MethodKind,
 }