Remove requiredTypes

pkg/compiler/lib/src/compiler.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.compiler_base;
 
 import 'dart:async' show
     EventSink,
     Future;
 
@@ skipping 1535 matching lines @@
     return symbolClass.rawType;
   }
 
   @override
   InterfaceType get typeType {
     typeClass.ensureResolved(resolution);
     return typeClass.rawType;
   }
 
   @override
+  InterfaceType get stackTraceType {
+    stackTraceClass.ensureResolved(resolution);
+    return stackTraceClass.rawType;
+  }
+
+  @override
   InterfaceType iterableType([DartType elementType]) {
     iterableClass.ensureResolved(resolution);
     InterfaceType type = iterableClass.rawType;
     if (elementType == null) {
       return type;
     }
     return type.createInstantiation([elementType]);
   }
 
   @override
@@ skipping 476 matching lines @@
     if (_otherDependencies == null) {
       _otherDependencies = new Setlet<Element>();
     }
     _otherDependencies.add(element.implementation);
   }
 
   Iterable<Element> get otherDependencies {
     return _otherDependencies != null ? _otherDependencies : const <Element>[];
   }
 }