Use destructuring assignments for named parameters (#180)

lib/runtime/dart/js.js

Index: lib/runtime/dart/js.js
diff --git a/lib/runtime/dart/js.js b/lib/runtime/dart/js.js
index 51bbe0a40a90879b0f24ab2e090fdeb3f16b5708..e4995576bdcb31293c663d9bb1acd4590bb07f60 100644
--- a/lib/runtime/dart/js.js
+++ b/lib/runtime/dart/js.js
@@ -153,8 +153,7 @@ dart_library.library('dart/js', null, /* Imports */[
     _fromJs(jsObject) {
       super._fromJs(jsObject);
     }
-    apply(args, opts) {
-      let thisArg = opts && 'thisArg' in opts ? opts.thisArg : null;
+    apply(args, {thisArg = null} = {}) {
       return _convertToDart(this[_jsObject].apply(_convertToJS(thisArg), args == null ? null : core.List.from(args[dartx.map](_convertToJS))));
     }
   }
@@ -176,7 +175,7 @@ dart_library.library('dart/js', null, /* Imports */[
       from(other) {
         super._fromJs((() => {
           let _ = [];
-          _[dartx.addAll](other[dartx.map](dart.as(_convertToJS, __CastType0)));
+          _[dartx.addAll](other[dartx.map](dart.as(_convertToJS, __CastType0$(E))));
           return _;
         })());
       }