dart2js cleanup: remove unused imports and variables

pkg/compiler/lib/src/enqueue.dart

Index: pkg/compiler/lib/src/enqueue.dart
diff --git a/pkg/compiler/lib/src/enqueue.dart b/pkg/compiler/lib/src/enqueue.dart
index ff3c21c35f92ca5b897bb6600fbe7542832af69a..eb7788cb22c8443119217c520ee1c28cf2eaaeda 100644
--- a/pkg/compiler/lib/src/enqueue.dart
+++ b/pkg/compiler/lib/src/enqueue.dart
@@ -6,13 +6,13 @@ library dart2js.enqueue;
 
 import 'dart:collection' show Queue;
 
-import 'common.dart';
+import 'common/codegen.dart' show CodegenWorkItem;
 import 'common/names.dart' show Identifiers;
 import 'common/resolution.dart' show Resolution;
-import 'common/work.dart' show ItemCompilationContext, WorkItem;
-import 'common/tasks.dart' show CompilerTask, DeferredAction, DeferredTask;
-import 'common/codegen.dart' show CodegenWorkItem;
 import 'common/resolution.dart' show ResolutionWorkItem;
+import 'common/tasks.dart' show CompilerTask, DeferredAction, DeferredTask;
+import 'common/work.dart' show ItemCompilationContext, WorkItem;
+import 'common.dart';
 import 'compiler.dart' show Compiler;
 import 'dart_types.dart' show DartType, InterfaceType;
 import 'elements/elements.dart'
@@ -25,10 +25,8 @@ import 'elements/elements.dart'
         Elements,
         FunctionElement,
         LibraryElement,
-        LocalFunctionElement,
         Member,
         MemberElement,
-        MethodElement,
         Name,
         TypedElement,
         TypedefElement;
@@ -41,7 +39,7 @@ import 'universe/use.dart'
     show DynamicUse, StaticUse, StaticUseKind, TypeUse, TypeUseKind;
 import 'universe/world_impact.dart'
     show ImpactUseCase, WorldImpact, WorldImpactVisitor;
-import 'util/util.dart' show Link, Setlet;
+import 'util/util.dart' show Setlet;
 
 typedef ItemCompilationContext ItemCompilationContextCreator();