Revert "Optimize subclass/subtype queries"

pkg/compiler/lib/src/elements/elements.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 elements;
 
 import '../common.dart';
 import '../common/resolution.dart' show
     Resolution;
 import '../compiler.dart' show
     Compiler;
 import '../constants/constructors.dart';
 import '../constants/expressions.dart';
-import '../core_types.dart' show
-    CoreClasses;
 import '../dart_types.dart';
 import '../resolution/scope.dart' show
     Scope;
 import '../resolution/tree_elements.dart' show
     TreeElements;
 import '../ordered_typeset.dart' show OrderedTypeSet;
 import '../script.dart';
 import '../tokens/token.dart' show
     Token,
     isUserDefinableOperator,
@@ skipping 1399 matching lines @@
   bool get isUnnamedMixinApplication;
 
   bool get hasBackendMembers;
   bool get hasLocalScopeMembers;
 
   /// Returns `true` if this class is `Object` from dart:core.
   bool get isObject;
 
   /// Returns `true` if this class implements [Function] either by directly
   /// implementing the interface or by providing a [call] method.
-  bool implementsFunction(CoreClasses coreClasses);
+  bool implementsFunction(Compiler compiler);
 
   /// Returns `true` if this class extends [cls] directly or indirectly.
   ///
   /// This method is not to be used for checking type hierarchy and assignments,
   /// because it does not take parameterized types into account.
   bool isSubclassOf(ClassElement cls);
 
   /// Returns `true` if this class explicitly implements [intrface].
   ///
   /// Note that, if [intrface] is the `Function` class, this method returns
@@ skipping 273 matching lines @@
   bool get isDeclaredByField;
 
   /// Returns `true` if this member is abstract.
   bool get isAbstract;
 
   /// If abstract, [implementation] points to the overridden concrete member,
   /// if any. Otherwise [implementation] points to the member itself.
   Member get implementation;
 }