Use LibraryIndex in CoreTypes instead of extending it.

pkg/front_end/lib/src/fasta/kernel/kernel_outline_shaker.dart

 // Copyright (c) 2016, 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.
 
 /// A transformation to create a self-contained modular kernel without
 /// unnecessary references to other libraries.
 library fasta.kernel.kernel_outline_shaker;
 
 import 'package:kernel/ast.dart';
 import 'package:kernel/core_types.dart';
@@ skipping 184 matching lines @@
     data.markClass(coreTypes.mapClass);
     data.markClass(coreTypes.iterableClass);
     data.markClass(coreTypes.iteratorClass);
     data.markClass(coreTypes.futureClass);
     data.markClass(coreTypes.streamClass);
     data.markClass(coreTypes.symbolClass);
     data.markClass(coreTypes.internalSymbolClass);
     data.markClass(coreTypes.typeClass);
     data.markClass(coreTypes.functionClass);
     data.markClass(coreTypes.invocationClass);
-    data.markMember(coreTypes.getMember("dart:_internal", "ExternalName", ""));
+    data.markMember(coreTypes.externalNameDefaultConstructor);
 
     // These are needed by the continuation (async/await) transformer:
-    data.markClass(coreTypes.getClass('dart:core', 'Iterator'));
-    data.markClass(coreTypes.getClass('dart:async', 'Future'));
-    data.markClass(coreTypes.getClass('dart:async', 'FutureOr'));
-    data.markClass(coreTypes.getClass('dart:async', 'Completer'));
-    data.markMember(coreTypes.getMember('dart:async', 'Completer', 'sync'));
-    data.markMember(coreTypes.getMember('dart:core', '_SyncIterable', ''));
-    data.markMember(coreTypes.getMember('dart:async', '_StreamIterator', ''));
-    data.markMember(coreTypes.getMember('dart:async', 'Future', 'microtask'));
-    data.markMember(
-        coreTypes.getMember('dart:async', '_AsyncStarStreamController', ''));
-    data.markMember(coreTypes.getTopLevelMember('dart:core', 'print'));
-    data.markMember(
-        coreTypes.getTopLevelMember('dart:async', '_asyncThenWrapperHelper'));
-    data.markMember(
-        coreTypes.getTopLevelMember('dart:async', '_asyncErrorWrapperHelper'));
-    data.markMember(coreTypes.getTopLevelMember('dart:async', '_awaitHelper'));
+    data.markClass(coreTypes.iteratorClass);
+    data.markClass(coreTypes.futureClass);
+    data.markClass(coreTypes.futureOrClass);
+    data.markClass(coreTypes.completerClass);
+    data.markMember(coreTypes.completerSyncConstructor);
+    data.markMember(coreTypes.syncIterableDefaultConstructor);
+    data.markMember(coreTypes.streamIteratorDefaultConstructor);
+    data.markMember(coreTypes.futureMicrotaskConstructor);
+    data.markMember(coreTypes.asyncStarStreamControllerDefaultConstructor);
+    data.markMember(coreTypes.printProcedure);
+    data.markMember(coreTypes.asyncThenWrapperHelperProcedure);
+    data.markMember(coreTypes.asyncErrorWrapperHelperProcedure);
+    data.markMember(coreTypes.awaitHelperProcedure);
 
     // These are needed by the mixin transformer
-    data.markMember(coreTypes.getMember('dart:core', '_InvocationMirror', ''));
-    data.markMember(coreTypes.getMember('dart:core', 'List', 'from'));
+    data.markMember(coreTypes.invocationMirrorDefaultConstructor);
+    data.markMember(coreTypes.listFromConstructor);
   }
 
   visitConstructor(Constructor node) {
     if (!node.initializers.any((i) => i is SuperInitializer)) {
       // super() is currently implicit.
       for (var ctor in node.enclosingClass.supertype.classNode.constructors) {
         if (ctor.name.name == '') data.markMember(ctor);
       }
     }
     node.visitChildren(this);
@@ skipping 159 matching lines @@
   /// Types appear to be encoded directly, so we have no need to preserve
   /// typedefs.
   // TODO(sigmund): revisit if this is not the case, the `inputError` in
   // [RootsMarker] is meant to detect this.
   Typedef visitTypedef(Typedef node) => null;
 
   TreeNode defaultTreeNode(TreeNode node) => node;
 }
 
 typedef bool Filter(Uri uri);