Distinguish statement and expression foreign code.

lib/compiler/implementation/lib/native_helper.dart

Index: lib/compiler/implementation/lib/native_helper.dart
diff --git a/lib/compiler/implementation/lib/native_helper.dart b/lib/compiler/implementation/lib/native_helper.dart
index c5ab8698b768fa5123b182322cd317728c951bc1..2b361b8349feeae8a49a01e948dbddd84356d95b 100644
--- a/lib/compiler/implementation/lib/native_helper.dart
+++ b/lib/compiler/implementation/lib/native_helper.dart
@@ -101,7 +101,7 @@ String toStringForNativeObject(var obj) {
  */
 void defineProperty(var obj, String property, var value) {
   JS('void', """Object.defineProperty(#, #,
-      {value: #, enumerable: false, writable: true, configurable: true});""",
+      {value: #, enumerable: false, writable: true, configurable: true})""",
       obj,
       property,
       value);