Move dart_types to elements/resolution_types

pkg/compiler/lib/src/resolution/scope.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.resolution.scope;
 
-import '../dart_types.dart';
+import '../elements/resolution_types.dart';
 import '../elements/elements.dart';
 
 abstract class Scope {
   /**
    * If an [Element] named `element.name` has already been added to this
    * [Scope], return that element and make no changes. If no such element has
    * been added, add the given [element] to this [Scope], and return [element].
    * Note that this operation is only allowed on mutable scopes such as
    * [MethodScope] and [BlockScope].
    */
@@ skipping 203 matching lines @@
 
   Element localLookup(String name) => library.find(name);
   Element lookup(String name) => localLookup(name);
 
   Element add(Element newElement) {
     throw "Cannot add an element to a library scope";
   }
 
   String toString() => 'LibraryScope($library)';
 }