Merge QueueFilter with EnqueuerStrategy

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 17 matching lines @@
 import 'core_types.dart' show CoreClasses, CommonElements, CoreTypes;
 import 'dart_types.dart' show DartType, DynamicType, InterfaceType, Types;
 import 'deferred_load.dart' show DeferredLoadTask;
 import 'diagnostics/code_location.dart';
 import 'diagnostics/diagnostic_listener.dart' show DiagnosticReporter;
 import 'diagnostics/invariant.dart' show REPORT_EXCESS_RESOLUTION;
 import 'diagnostics/messages.dart' show Message, MessageTemplate;
 import 'dump_info.dart' show DumpInfoTask;
 import 'elements/elements.dart';
 import 'elements/modelx.dart' show ErroneousElementX;
-import 'enqueue.dart'
-    show Enqueuer, EnqueueTask, ResolutionEnqueuer, QueueFilter;
+import 'enqueue.dart' show Enqueuer, EnqueueTask, ResolutionEnqueuer;
 import 'environment.dart';
 import 'id_generator.dart';
 import 'io/source_information.dart' show SourceInformation;
 import 'js_backend/backend_helpers.dart' as js_backend show BackendHelpers;
 import 'js_backend/js_backend.dart' as js_backend show JavaScriptBackend;
 import 'library_loader.dart'
     show
         ElementScanner,
         LibraryLoader,
         LibraryLoaderTask,
@@ skipping 124 matching lines @@
 
   /// The constant environment for the frontend interpretation of compile-time
   /// constants.
   ConstantEnvironment constants;
 
   EnqueueTask enqueuer;
   DeferredLoadTask deferredLoadTask;
   MirrorUsageAnalyzerTask mirrorUsageAnalyzerTask;
   DumpInfoTask dumpInfoTask;
 
-  /// A customizable filter that is applied to enqueued work items.
-  QueueFilter enqueuerFilter = new QueueFilter();
-
   bool get hasFunctionApplySupport => resolverWorld.hasFunctionApplySupport;
   bool get hasIsolateSupport => resolverWorld.hasIsolateSupport;
 
   bool get hasCrashed => _reporter.hasCrashed;
 
   Stopwatch progress;
 
   bool get shouldPrintProgress {
     return options.verbose && progress.elapsedMilliseconds > 500;
   }
@@ skipping 2060 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;
 }