Remove BackendClasses and JavaScriptBackendClasses.

pkg/compiler/lib/src/constants/expressions.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.
 
 library dart2js.constants.expressions;
 
 import '../common.dart';
 import '../constants/constant_system.dart';
 import '../common_elements.dart';
 import '../elements/types.dart';
@@ skipping 464 matching lines @@
   @override
   ConstantValue evaluate(
       Environment environment, ConstantSystem constantSystem) {
     Map<ConstantValue, ConstantValue> valueMap =
         <ConstantValue, ConstantValue>{};
     for (int index = 0; index < keys.length; index++) {
       ConstantValue key = keys[index].evaluate(environment, constantSystem);
       ConstantValue value = values[index].evaluate(environment, constantSystem);
       valueMap[key] = value;
     }
-    return constantSystem.createMap(
-        environment.commonElements,
-        environment.backendClasses,
-        type,
-        valueMap.keys.toList(),
-        valueMap.values.toList());
+    return constantSystem.createMap(environment.commonElements, type,
+        valueMap.keys.toList(), valueMap.values.toList());
   }
 
   ConstantExpression apply(NormalizedArguments arguments) {
     return new MapConstantExpression(
         type,
         keys.map((k) => k.apply(arguments)).toList(),
         values.map((v) => v.apply(arguments)).toList());
   }
 
   @override
@@ skipping 230 matching lines @@
   int _computeHashCode() => 13 * name.hashCode;
 
   @override
   bool _equals(SymbolConstantExpression other) {
     return name == other.name;
   }
 
   @override
   ConstantValue evaluate(
       Environment environment, ConstantSystem constantSystem) {
-    return constantSystem.createSymbol(
-        environment.commonElements, environment.backendClasses, name);
+    return constantSystem.createSymbol(environment.commonElements, name);
   }
 
   @override
   InterfaceType getKnownType(CommonElements commonElements) =>
       commonElements.symbolType;
 }
 
 /// Type literal.
 class TypeConstantExpression extends ConstantExpression {
   /// Either [DynamicType] or a raw [GenericType].
@@ skipping 14 matching lines @@
   }
 
   @override
   void _createStructuredText(StringBuffer sb) {
     sb.write('Type(type=$type)');
   }
 
   @override
   ConstantValue evaluate(
       Environment environment, ConstantSystem constantSystem) {
-    return constantSystem.createType(
-        environment.commonElements, environment.backendClasses, type);
+    return constantSystem.createType(environment.commonElements, type);
   }
 
   @override
   int _computeHashCode() => 13 * type.hashCode;
 
   @override
   bool _equals(TypeConstantExpression other) {
     return type == other.type;
   }
 
@@ skipping 1153 matching lines @@
     visit(exp.name);
     if (exp.defaultValue != null) {
       sb.write(', defaultValue: ');
       visit(exp.defaultValue);
     }
     sb.write(')');
   }
 
   String toString() => sb.toString();
 }