Move dart_types to elements/resolution_types

pkg/compiler/lib/src/resolution/constructors.dart

 // Copyright (c) 2015, 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.resolution.constructors;
 
 import '../common.dart';
 import '../common/resolution.dart' show Resolution;
 import '../constants/constructors.dart'
     show
         GenerativeConstantConstructor,
         RedirectingGenerativeConstantConstructor;
 import '../constants/expressions.dart';
-import '../dart_types.dart';
+import '../elements/resolution_types.dart';
 import '../elements/elements.dart';
 import '../elements/modelx.dart'
     show
         ConstructorElementX,
         ErroneousConstructorElementX,
         ErroneousElementX,
         ErroneousFieldElementX,
         FieldElementX,
         InitializingFormalElementX,
         ParameterElementX;
@@ skipping 854 matching lines @@
     // constructors.
     return null;
   }
   // TODO(johnniwinther): Use [Name] for lookup.
   ConstructorElement constructor = cls.lookupConstructor(constructorName);
   if (constructor != null) {
     constructor = constructor.declaration;
   }
   return constructor;
 }