pkg/compiler: fix imports

pkg/compiler/lib/src/use_unused_api.dart

Index: pkg/compiler/lib/src/use_unused_api.dart
diff --git a/pkg/compiler/lib/src/use_unused_api.dart b/pkg/compiler/lib/src/use_unused_api.dart
index d3578f776ed5f0571334a40a2c260dcf8503aa11..468fae3fe1b4ee3c466d2180d7f4fec0c9c1d894 100644
--- a/pkg/compiler/lib/src/use_unused_api.dart
+++ b/pkg/compiler/lib/src/use_unused_api.dart
@@ -9,7 +9,6 @@
 library dart2js.use_unused_api;
 
 import '../compiler.dart' as api;
-
 import 'colors.dart' as colors;
 import 'compiler.dart' as compiler;
 import 'constants/constant_system.dart' as constants;
@@ -19,9 +18,8 @@ import 'constants/expressions.dart' as constants;
 import 'constants/values.dart' as constants;
 import 'cps_ir/cps_ir_builder.dart' as ir_builder;
 import 'cps_ir/cps_ir_builder_task.dart' as ir_builder;
-import 'tree_ir/tree_ir_nodes.dart' as tree_ir;
-import 'dart_types.dart' as dart_types;
 import 'dart2js.dart' as dart2js;
+import 'dart_types.dart' as dart_types;
 import 'deferred_load.dart' as deferred;
 import 'diagnostics/source_span.dart' as diagnostics;
 import 'elements/elements.dart' as elements;
@@ -33,21 +31,21 @@ import 'io/line_column_provider.dart' as io;
 import 'io/source_map_builder.dart' as io;
 import 'js/js.dart' as js;
 import 'js_backend/js_backend.dart' as js_backend;
-import 'js_emitter/js_emitter.dart' as js_emitter;
 import 'js_emitter/full_emitter/emitter.dart' as full;
+import 'js_emitter/js_emitter.dart' as js_emitter;
 import 'js_emitter/program_builder/program_builder.dart' as program_builder;
-import 'resolution/semantic_visitor.dart' as semantic_visitor;
+import 'parser/partial_elements.dart'
+    show PartialClassElement, PartialFunctionElement;
 import 'resolution/operators.dart' as operators;
+import 'resolution/semantic_visitor.dart' as semantic_visitor;
 import 'script.dart';
 import 'source_file_provider.dart' as source_file_provider;
 import 'ssa/nodes.dart' as ssa;
 import 'tree/tree.dart' as tree;
+import 'tree_ir/tree_ir_nodes.dart' as tree_ir;
 import 'util/util.dart' as util;
 import 'world.dart';
 
-import 'parser/partial_elements.dart'
-    show PartialClassElement, PartialFunctionElement;
-
 class ElementVisitor extends elements_visitor.BaseElementVisitor {
   visitElement(e, a) {}
 }