Move dart2jslib parts into separate libraries.

pkg/compiler/lib/src/resolution/resolution.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 resolution;
 
 import 'dart:collection' show Queue;
 
 import '../compile_time_constants.dart';
 import '../constants/constructors.dart';
 import '../constants/expressions.dart';
 import '../constants/values.dart';
 import '../core_types.dart';
 import '../dart_backend/dart_backend.dart' show DartBackend;
 import '../dart_types.dart';
 import '../dart2jslib.dart' hide DynamicAccess;
+import '../enqueue.dart' show
+    ResolutionEnqueuer,
+    WorldImpact;
 import '../tree/tree.dart';
 import '../scanner/scannerlib.dart';
 import '../elements/elements.dart';
-
 import '../elements/modelx.dart' show
     BaseClassElementX,
     BaseFunctionElementX,
     ConstructorElementX,
     ErroneousConstructorElementX,
     ErroneousElementX,
     ErroneousFieldElementX,
     ErroneousInitializingFormalElementX,
     FieldElementX,
     FormalElementX,
@@ skipping 10 matching lines @@
     MethodElementX,
     MixinApplicationElementX,
     ParameterElementX,
     ParameterMetadataAnnotation,
     SetterElementX,
     SynthesizedConstructorElementX,
     TypeVariableElementX,
     TypedefElementX,
     VariableElementX,
     VariableList;
-
+import '../messages.dart' show MessageKind;
 import '../ordered_typeset.dart' show OrderedTypeSet, OrderedTypeSetBuilder;
 import '../types/types.dart' show TypeMask;
 import '../util/util.dart';
 import '../universe/universe.dart' show
     CallStructure,
+    Selector,
     SelectorKind,
     UniverseSelector;
+import '../world.dart' show World;
 
 import 'access_semantics.dart';
 import 'class_members.dart' show MembersCreator;
 import 'enum_creator.dart';
 import 'operators.dart';
 import 'secret_tree_element.dart' show getTreeElement, setTreeElement;
 import 'send_structure.dart';
 
 part 'class_hierarchy.dart';
 part 'constructors.dart';
 part 'label_scope.dart';
 part 'members.dart';
 part 'registry.dart';
 part 'resolution_common.dart';
 part 'resolution_result.dart';
 part 'scope.dart';
 part 'signatures.dart';
 part 'tree_elements.dart';
 part 'typedefs.dart';
 part 'type_resolver.dart';
 part 'variables.dart';