Reject deprecated language features.

dart/sdk/lib/_internal/compiler/implementation/native_handler.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.
 
 library native;
 
 import 'dart:uri';
 import 'dart2jslib.dart' hide SourceString;
 import 'elements/elements.dart';
 import 'js_backend/js_backend.dart';
@@ skipping 174 matching lines @@
   registerMethod(Element method) {
     if (isNativeMethod(method)) {
       processNativeBehavior(
           NativeBehavior.ofMethod(method, compiler),
           method);
       flushQueue();
     }
   }
 
   bool isNativeMethod(Element element) {
+    if (!element.getLibrary().canUseNative) return false;
     // Native method?
-    Node node = element.parseNode(compiler);
-    if (node is! FunctionExpression) return false;
-    node = node.body;
-    Token token = node.getBeginToken();
-    if (token.stringValue == 'native') return true;
-    return false;
+    return compiler.withCurrentElement(element, () {
+      Node node = element.parseNode(compiler);
+      if (node is! FunctionExpression) return false;
+      node = node.body;
+      Token token = node.getBeginToken();
+      if (identical(token.stringValue, 'native')) return true;
+      return false;
+    });
   }
 
   void registerFieldLoad(Element field) {
     processNativeBehavior(
         NativeBehavior.ofFieldLoad(field, compiler),
         field);
     flushQueue();
   }
 
   void registerFieldStore(Element field) {
@@ skipping 622 matching lines @@
                                       String parameters) {
   buffer.add("  if (Object.getPrototypeOf(this).hasOwnProperty");
   buffer.add("('$methodName')) {\n");
   buffer.add("  $code");
   buffer.add("  } else {\n");
   buffer.add("    return Object.prototype.$methodName.call(this");
   buffer.add(parameters == '' ? '' : ', $parameters');
   buffer.add(");\n");
   buffer.add("  }\n");
 }