Emit only instance members from global polluters

Author: zombie

src/build/emitter.ts

@@ -1064,7 +1064,7 @@ export function emitWebIdl(
   /// Emit all members of every interfaces at the root level.
   /// Called only once on the global polluter object
   function emitAllMembers(i: Browser.Interface) {
-    emitMembers(/*prefix*/ "declare var ", EmitScope.All, i);
+    emitMembers(/*prefix*/ "declare var ", EmitScope.InstanceOnly, i);
 
     for (const relatedIName of iNameToIDependList[i.name]) {
       const i = allInterfacesMap[relatedIName];