Move native and js interop properties from the element model to the JS backend

pkg/compiler/lib/src/library_loader.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 dart2js.library_loader;
 
 import 'dart:async';
 
 import 'common.dart';
 import 'common/names.dart' show
@@ skipping 13 matching lines @@
     CompilationUnitElementX,
     DeferredLoaderGetterElementX,
     ErroneousElementX,
     ExportElementX,
     ImportElementX,
     LibraryElementX,
     LibraryDependencyElementX,
     PrefixElementX,
     SyntheticImportElement;
 
-import 'native/native.dart' as native;
 import 'script.dart';
 import 'tree/tree.dart';
 import 'util/util.dart' show
     Link,
     LinkBuilder;
 
 /**
  * [CompilerTask] for loading libraries and setting up the import/export scopes.
  *
  * The library loader uses four different kinds of URIs in different parts of
@@ skipping 579 matching lines @@
   LibraryElement createLibrarySync(
       LibraryDependencyHandler handler,
       Script script,
       Uri resolvedUri) {
     LibraryElement element = new LibraryElementX(script, resolvedUri);
     return reporter.withCurrentElement(element, () {
       if (handler != null) {
         handler.registerNewLibrary(element);
         libraryCanonicalUriMap[resolvedUri] = element;
       }
-      native.maybeEnableNative(compiler, element);
       compiler.scanner.scanLibrary(element);
       return element;
     });
   }
 }
 
 
 /// A state machine for checking script tags come in the correct order.
 class TagState {
   /// Initial state.
@@ skipping 699 matching lines @@
         }
         suffixes.add(const Link<Uri>().prepend(canonicalUri));
       }
       suffixChainMap[library] = suffixes;
       return;
     }
 
     computeSuffixes(rootLibrary, const Link<Uri>());
   }
 }