Eliminate multi-callback structure for LibraryLoader.

pkg/compiler/lib/src/js_backend/annotations.dart

 // Copyright (c) 2017, 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.annotations;
 
 import '../common.dart';
 import '../compiler.dart' show Compiler;
 import '../constants/values.dart';
 import '../elements/elements.dart';
 import 'backend.dart';
 
 /// Handling of special annotations for tests.
 class Annotations {
   static final Uri PACKAGE_EXPECT =
       new Uri(scheme: 'package', path: 'expect/expect.dart');
 
   final Compiler compiler;
 
   ClassElement expectNoInlineClass;
   ClassElement expectTrustTypeAnnotationsClass;
   ClassElement expectAssumeDynamicClass;
 
   JavaScriptBackend get backend => compiler.backend;
 
   DiagnosticReporter get reporter => compiler.reporter;
 
   Annotations(this.compiler);
 
-  void onLibraryScanned(LibraryElement library) {
+  void onLibraryLoaded(LibraryElement library) {
     if (library.canonicalUri == PACKAGE_EXPECT) {
       expectNoInlineClass = library.find('NoInline');
       expectTrustTypeAnnotationsClass = library.find('TrustTypeAnnotations');
       expectAssumeDynamicClass = library.find('AssumeDynamic');
       if (expectNoInlineClass == null ||
           expectTrustTypeAnnotationsClass == null ||
           expectAssumeDynamicClass == null) {
         // This is not the package you're looking for.
         expectNoInlineClass = null;
         expectTrustTypeAnnotationsClass = null;
@@ skipping 35 matching lines @@
           ConstructedConstantValue constructedConstant = value;
           if (constructedConstant.type.element == annotationClass) {
             return true;
           }
         }
       }
       return false;
     });
   }
 }