pkg/compiler: clean up imports

pkg/compiler/lib/src/js_backend/type_variable_handler.dart

Index: pkg/compiler/lib/src/js_backend/type_variable_handler.dart
diff --git a/pkg/compiler/lib/src/js_backend/type_variable_handler.dart b/pkg/compiler/lib/src/js_backend/type_variable_handler.dart
index 1ffbcb30bb04bfdf968d7950797c0338023cf0f3..ada9d167a6e5f0843640de687723b982450f9086 100644
--- a/pkg/compiler/lib/src/js_backend/type_variable_handler.dart
+++ b/pkg/compiler/lib/src/js_backend/type_variable_handler.dart
@@ -3,19 +3,18 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import '../common.dart';
-import '../common/registry.dart' show EagerRegistry, Registry;
+import '../common/registry.dart' show Registry;
 import '../compiler.dart' show Compiler;
 import '../constants/expressions.dart';
 import '../constants/values.dart';
 import '../dart_types.dart';
 import '../elements/elements.dart';
-import '../enqueue.dart' show Enqueuer, ResolutionEnqueuer;
+import '../enqueue.dart' show Enqueuer;
 import '../js/js.dart' as jsAst;
 import '../js_emitter/js_emitter.dart'
     show CodeEmitterTask, MetadataCollector, Placeholder;
 import '../universe/call_structure.dart' show CallStructure;
-import '../universe/use.dart'
-    show DynamicUse, StaticUse, StaticUseKind, TypeUse, TypeUseKind;
+import '../universe/use.dart' show StaticUse;
 import '../util/util.dart';
 import 'backend.dart';