Use entities in js_emitter/model.dart

pkg/compiler/lib/src/js_backend/constant_handler_javascript.dart

 // Copyright (c) 2014, 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.
 
 import '../compile_time_constants.dart';
 import '../compiler.dart' show Compiler;
 import '../constants/constant_system.dart';
 import '../constants/expressions.dart';
 import '../constants/values.dart';
 import '../elements/elements.dart';
@@ skipping 100 matching lines @@
  * constants, initializations of global and static fields, and default values of
  * optional parameters for the JavaScript interpretation of constants.
  */
 class JavaScriptConstantCompiler extends ConstantCompilerBase
     implements BackendConstantEnvironment {
   /** Set of all registered compiled constants. */
   final Set<ConstantValue> compiledConstants = new Set<ConstantValue>();
 
   // TODO(johnniwinther): Move this to the backend constant handler.
   /** Caches the statics where the initial value cannot be eagerly compiled. */
-  final Set<VariableElement> lazyStatics = new Set<VariableElement>();
+  final Set<FieldElement> lazyStatics = new Set<FieldElement>();
 
   // Constants computed for constant expressions.
   final Map<Node, ConstantExpression> nodeConstantMap =
       new Map<Node, ConstantExpression>();
 
   // Constants computed for metadata.
   // TODO(johnniwinther): Remove this when no longer used by
   // poi/forget_element_test.
   final Map<MetadataAnnotation, ConstantExpression> metadataConstantMap =
       new Map<MetadataAnnotation, ConstantExpression>();
@@ skipping 18 matching lines @@
 
   @override
   void registerLazyStatic(FieldElement element) {
     lazyStatics.add(element);
   }
 
   void addCompileTimeConstantForEmission(ConstantValue constant) {
     compiledConstants.add(constant);
   }
 
-  List<VariableElement> getLazilyInitializedFieldsForEmission() {
-    return new List<VariableElement>.from(lazyStatics);
+  List<FieldElement> getLazilyInitializedFieldsForEmission() {
+    return new List<FieldElement>.from(lazyStatics);
   }
 
   /**
    * Returns a list of constants topologically sorted so that dependencies
    * appear before the dependent constant.  [preSortCompare] is a comparator
    * function that gives the constants a consistent order prior to the
    * topological sort which gives the constants an ordering that is less
    * sensitive to perturbations in the source code.
    */
   List<ConstantValue> getConstantsForEmission([preSortCompare]) {
@@ skipping 97 matching lines @@
 class ForgetConstantNodeVisitor extends Visitor {
   final JavaScriptConstantCompiler constants;
 
   ForgetConstantNodeVisitor(this.constants);
 
   void visitNode(Node node) {
     node.visitChildren(this);
     constants.nodeConstantMap.remove(node);
   }
 }