pkg/compiler: clean up imports

pkg/compiler/lib/src/resolution/class_hierarchy.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.class_hierarchy;
 
 import '../common.dart';
 import '../common/resolution.dart' show Feature, Resolution;
 import '../core_types.dart' show CoreClasses, CoreTypes;
 import '../dart_types.dart';
 import '../elements/elements.dart';
 import '../elements/modelx.dart'
     show
         BaseClassElementX,
         ErroneousElementX,
         MixinApplicationElementX,
         SynthesizedConstructorElementX,
         TypeVariableElementX,
         UnnamedMixinApplicationElementX;
 import '../ordered_typeset.dart' show OrderedTypeSet, OrderedTypeSetBuilder;
 import '../tree/tree.dart';
+import '../universe/call_structure.dart' show CallStructure;
 import '../util/util.dart' show Link, Setlet;
-import '../universe/call_structure.dart' show CallStructure;
-
 import 'enum_creator.dart';
 import 'members.dart' show lookupInScope;
 import 'registry.dart' show ResolutionRegistry;
 import 'resolution_common.dart' show CommonResolverVisitor, MappingVisitor;
 import 'scope.dart' show Scope, TypeDeclarationScope;
 
 class TypeDefinitionVisitor extends MappingVisitor<DartType> {
   Scope scope;
   final TypeDeclarationElement enclosingElement;
   TypeDeclarationElement get element => enclosingElement;
@@ skipping 609 matching lines @@
     Identifier selector = node.selector.asIdentifier();
     var e = prefixElement.lookupLocalMember(selector.source);
     if (e == null || !e.impliesType) {
       reporter.reportErrorMessage(node.selector,
           MessageKind.CANNOT_RESOLVE_TYPE, {'typeName': node.selector});
       return;
     }
     loadSupertype(e, node);
   }
 }