Distinguish statement and expression foreign code.

lib/compiler/implementation/lib/native_helper.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 String typeNameInChrome(obj) {
   String name = JS('String', "#.constructor.name", obj);
   if (name == 'Window') return 'DOMWindow';
   if (name == 'CanvasPixelArray') return 'Uint8ClampedArray';
   return name;
 }
@@ skipping 83 matching lines @@
 
 String toStringForNativeObject(var obj) {
   return 'Instance of ${getTypeNameOf(obj)}';
 }
 
 /**
  * Sets a JavaScript property on an object.
  */
 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);
 }
 
 /**
  * Helper method to throw a [NoSuchMethodException] for a invalid call
  * on a native object.
  */
 void throwNoSuchMethod(obj, name, arguments) {
@@ skipping 162 matching lines @@
   }
   return result;
 }
 
 /**
  * Called by the compiler to setup [_dynamicMetadata].
  */
 void dynamicSetMetadata(List<List<String>> inputTable) {
   _dynamicMetadata = buildDynamicMetadata(inputTable);
 }