dart2js OldEmitter: Small cleanups in output.

pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart

Index: pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart b/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
index 3fa2c8f1683675b33c93a84dfdf1b49a4b13622c..95ea5d973d6a6062230a42196ffc443c6c052dfd 100644
--- a/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart
@@ -1018,12 +1018,10 @@ class OldEmitter implements Emitter {
     jsAst.FunctionDeclaration decl = js.statement('''
       function init() {
         $isolateProperties = Object.create(null);
-        (function(){
-         #allClasses = Object.create(null);
-         #interceptorsByTag = Object.create(null);
-         #leafTags = Object.create(null);
-         #finishedClasses = Object.create(null);
-        })();
+        #allClasses = Object.create(null);
+        #interceptorsByTag = Object.create(null);
+        #leafTags = Object.create(null);
+        #finishedClasses = Object.create(null);
 
         if (#needsLazyInitializer) {
           $lazyInitializerName = function (prototype, staticName, fieldName,