dart2js cleanup: remove unused imports and variables

pkg/compiler/lib/src/cps_ir/inline.dart

Index: pkg/compiler/lib/src/cps_ir/inline.dart
diff --git a/pkg/compiler/lib/src/cps_ir/inline.dart b/pkg/compiler/lib/src/cps_ir/inline.dart
index 5a004212d2ea90122d7172df3cfbce15172dbdf4..9454e38a336ad2616fae0db7dfec8bc7fbad0d5b 100644
--- a/pkg/compiler/lib/src/cps_ir/inline.dart
+++ b/pkg/compiler/lib/src/cps_ir/inline.dart
@@ -4,21 +4,21 @@
 
 library cps_ir.optimization.inline;
 
-import 'cps_fragment.dart';
-import 'cps_ir_builder.dart' show ThisParameterLocal;
-import 'cps_ir_nodes.dart';
-import 'optimizers.dart';
-import 'type_mask_system.dart' show TypeMaskSystem;
+import 'package:js_ast/js_ast.dart' as js;
+
 import '../dart_types.dart' show DartType, GenericType;
-import '../world.dart' show World;
 import '../elements/elements.dart';
-import '../js_backend/js_backend.dart' show JavaScriptBackend;
 import '../js_backend/codegen/task.dart' show CpsFunctionCompiler;
-import '../types/types.dart'
-    show FlatTypeMask, ForwardingTypeMask, TypeMask, UnionTypeMask;
+import '../js_backend/js_backend.dart' show JavaScriptBackend;
+import '../types/types.dart' show TypeMask;
 import '../universe/call_structure.dart' show CallStructure;
 import '../universe/selector.dart' show Selector;
-import 'package:js_ast/js_ast.dart' as js;
+import '../world.dart' show World;
+import 'cps_fragment.dart';
+import 'cps_ir_builder.dart' show ThisParameterLocal;
+import 'cps_ir_nodes.dart';
+import 'optimizers.dart';
+import 'type_mask_system.dart' show TypeMaskSystem;
 
 /// Inlining stack entries.
 ///