Handle use of fromEnvironment from serialized data.

pkg/compiler/lib/src/compiler.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 dart2js.compiler_base;
 
 import 'dart:async' show EventSink, Future;
 
 import '../compiler_new.dart' as api;
 import 'cache_strategy.dart' show CacheStrategy;
@@ skipping 191 matching lines @@
 
   // Initialized when dart:mirrors is loaded.
   ClassElement deferredLibraryClass;
 
   /// Document class from dart:mirrors.
   ClassElement documentClass;
   Element identicalFunction;
   Element loadLibraryFunction;
   Element functionApplyMethod;
 
-  /// The [int.fromEnvironment] constructor.
-  ConstructorElement intEnvironment;
-
-  /// The [bool.fromEnvironment] constructor.
-  ConstructorElement boolEnvironment;
-
-  /// The [String.fromEnvironment] constructor.
-  ConstructorElement stringEnvironment;
-
   // TODO(zarah): Remove this map and incorporate compile-time errors
   // in the model.
   /// Tracks elements with compile-time errors.
   final Map<Element, List<DiagnosticMessage>> elementsWithCompileTimeErrors =
       new Map<Element, List<DiagnosticMessage>>();
 
   final Environment environment;
   // TODO(sigmund): delete once we migrate the rest of the compiler to use
   // `environment` directly.
   @deprecated
@@ skipping 385 matching lines @@
   // [JavaScriptBackend]. Currently needed for testing.
   String get patchVersion => backend.patchVersion;
 
   // TODO(johnniwinther): Remove this. All elements should be looked up on
   // demand.
   void onClassResolved(ClassElement cls) {
     if (mirrorSystemClass == cls) {
       mirrorSystemGetNameFunction = cls.lookupLocalMember('getName');
     } else if (mirrorsUsedClass == cls) {
       mirrorsUsedConstructor = cls.constructors.head;
-    } else if (coreClasses.intClass == cls) {
-      intEnvironment = cls.lookupConstructor(Identifiers.fromEnvironment);
-    } else if (coreClasses.stringClass == cls) {
-      stringEnvironment = cls.lookupConstructor(Identifiers.fromEnvironment);
-    } else if (coreClasses.boolClass == cls) {
-      boolEnvironment = cls.lookupConstructor(Identifiers.fromEnvironment);
     }
   }
 
   void initializeCoreClasses() {
     final List missingCoreClasses = [];
     ClassElement lookupCoreClass(String name) {
       ClassElement result = coreLibrary.find(name);
       if (result == null) {
         missingCoreClasses.add(name);
       }
@@ skipping 1474 matching lines @@
   _ElementScanner(this.scanner);
   void scanLibrary(LibraryElement library) => scanner.scanLibrary(library);
   void scanUnit(CompilationUnitElement unit) => scanner.scan(unit);
 }
 
 class _EmptyEnvironment implements Environment {
   const _EmptyEnvironment();
 
   String valueOf(String key) => null;
 }