Remove requiredTypes

pkg/compiler/lib/src/deferred_load.dart

 // Copyright (c) 2014, 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 deferred_load;
 
 import 'common.dart';
 import 'common/backend_api.dart' show
     Backend;
 import 'common/tasks.dart' show
@@ skipping 301 matching lines @@
 
         WorldImpact worldImpact =
             compiler.resolution.getWorldImpact(analyzableElement);
         elements.addAll(worldImpact.staticUses);
         elements.addAll(worldImpact.closures);
         for (DartType type in worldImpact.typeLiterals) {
           if (type.isTypedef || type.isInterfaceType) {
             elements.add(type.element);
           }
         }
-        for (InterfaceType type in worldImpact.instantiatedTypes) {
-          elements.add(type.element);
+        worldImpact.instantiatedTypes.forEach(collectTypeDependencies);
+        worldImpact.isChecks.forEach(collectTypeDependencies);
+        worldImpact.asCasts.forEach(collectTypeDependencies);
+        worldImpact.onCatchTypes.forEach(collectTypeDependencies);
+        if (compiler.enableTypeAssertions) {
+          worldImpact.checkedModeChecks.forEach(collectTypeDependencies);
         }
 
         TreeElements treeElements = analyzableElement.resolvedAst.elements;
         assert(treeElements != null);
 
-        for (DartType type in treeElements.requiredTypes) {
-          collectTypeDependencies(type);
-        }
-
         treeElements.forEachConstantNode((Node node, _) {
           // Explicitly depend on the backend constants.
           ConstantValue value =
               backend.constants.getConstantValueForNode(node, treeElements);
           if (value != null) {
             // TODO(johnniwinther): Assert that all constants have values when
             // these are directly evaluated.
             constants.add(value);
           }
         });
@@ skipping 639 matching lines @@
     return result;
   }
 
   bool operator ==(other) {
     if (other is! _DeclaredDeferredImport) return false;
     return declaration == other.declaration;
   }
 
   int get hashCode => declaration.hashCode * 17;
 }