Add ClosedWorld.elementEnvironment and remove Compiler.elementEnvironment

pkg/compiler/lib/src/js_emitter/full_emitter/emitter.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.js_emitter.full_emitter;
 
 import 'dart:collection' show HashMap;
 import 'dart:convert';
 
 import 'package:js_runtime/shared/embedded_names.dart' as embeddedNames;
@@ skipping 106 matching lines @@
   /// True if [ContainerBuilder.addMemberMethodFromInfo] used "structured info",
   /// that is, some function was needed for reflection, had stubs, or had a
   /// super alias.
   bool needsStructuredMemberInfo = false;
 
   final Namer namer;
   ConstantEmitter constantEmitter;
   NativeEmitter get nativeEmitter => task.nativeEmitter;
   TypeTestRegistry get typeTestRegistry => task.typeTestRegistry;
   CommonElements get commonElements => _closedWorld.commonElements;
-  ElementEnvironment get _elementEnvironment => compiler.elementEnvironment;
+  ElementEnvironment get _elementEnvironment => _closedWorld.elementEnvironment;
 
   // The full code that is written to each hunk part-file.
   Map<OutputUnit, CodeOutput> outputBuffers = new Map<OutputUnit, CodeOutput>();
 
   String classesCollector;
   final Map<jsAst.Name, String> mangledFieldNames =
       new HashMap<jsAst.Name, String>();
   final Map<jsAst.Name, String> mangledGlobalFieldNames =
       new HashMap<jsAst.Name, String>();
   final Set<jsAst.Name> recordedMangledNames = new Set<jsAst.Name>();
@@ skipping 1783 matching lines @@
     // data.
     mapping["_comment"] = "This mapping shows which compiled `.js` files are "
         "needed for a given deferred library import.";
     mapping.addAll(compiler.deferredLoadTask.computeDeferredMap());
     compiler.outputProvider(
         compiler.options.deferredMapUri.path, '', OutputType.info)
       ..add(const JsonEncoder.withIndent("  ").convert(mapping))
       ..close();
   }
 }