Revert "New implementation of {,Linked}Hash{Set,Map}."

sdk/lib/_internal/compiler/implementation/native_handler.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 native;
 
 import 'dart:collection' show Queue;
 import 'dart:uri';
 import 'dart2jslib.dart' hide SourceString;
 import 'dart_types.dart';
@@ skipping 344 matching lines @@
     // all the native classes are included.
     if (unusedClasses.isEmpty && !allUsedBefore) {
       compiler.log('All native types marked as used due to $cause.');
     }
   }
 
   enqueueUnusedClassesMatching(bool predicate(classElement),
                                cause,
                                [String reason]) {
     Iterable matches = unusedClasses.where(predicate);
-    matches.toList().forEach((c) => enqueueClass(c, cause));
+    matches.forEach((c) => enqueueClass(c, cause));
   }
 
   onFirstNativeClass() {
     staticUse(name) => world.registerStaticUse(compiler.findHelper(name));
 
     staticUse(const SourceString('dynamicFunction'));
     staticUse(const SourceString('dynamicSetMetadata'));
     staticUse(const SourceString('defineProperty'));
     staticUse(const SourceString('toStringForNativeObject'));
     staticUse(const SourceString('hashCodeForNativeObject'));
@@ skipping 517 matching lines @@
   } else {
     if (parameters.parameterCount != 0) {
       compiler.cancel(
           'native "..." syntax is restricted to functions with zero parameters',
           node: nativeBody);
     }
     LiteralString jsCode = nativeBody.asLiteralString();
     builder.push(new HForeign.statement(jsCode.dartString, <HInstruction>[]));
   }
 }