Don't tag fromEnvironment constructors as native

pkg/compiler/lib/src/js_backend/backend.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 js_backend.backend;
 
 import '../common.dart';
 import '../common/backend_api.dart'
     show ForeignResolver, NativeRegistry, ImpactTransformer;
 import '../common/codegen.dart' show CodegenWorkItem;
@@ skipping 1054 matching lines @@
   void onCodegenEnd() {
     sourceInformationStrategy.onComplete();
     tracer.close();
   }
 
   // Does this element belong in the output
   bool shouldOutput(Element element) => true;
 
   /// Returns `true` if the `native` pseudo keyword is supported for [library].
   bool canLibraryUseNative(LibraryEntity library) {
-    return native.maybeEnableNative(compiler, library);
+    return native.maybeEnableNative(library.canonicalUri,
+        allowNativeExtensions: compiler.options.allowNativeExtensions);
   }
 
   bool isTargetSpecificLibrary(LibraryElement library) {
     Uri canonicalUri = library.canonicalUri;
     if (canonicalUri == Uris.dart__js_helper ||
         canonicalUri == Uris.dart__interceptors) {
       return true;
     }
     return false;
   }
@@ skipping 280 matching lines @@
 
   bool canUseAliasedSuperMember(MemberEntity member, Selector selector) {
     return !selector.isGetter;
   }
 
   /// Returns `true` if [member] is called from a subclass via `super`.
   bool isAliasedSuperMember(MemberEntity member) {
     return _aliasedSuperMembers.contains(member);
   }
 }