pkg/compiler: fix imports

pkg/compiler/lib/src/compile_time_constants.dart

Index: pkg/compiler/lib/src/compile_time_constants.dart
diff --git a/pkg/compiler/lib/src/compile_time_constants.dart b/pkg/compiler/lib/src/compile_time_constants.dart
index 1c066ed2c0485add0ec9bd279654610dc58306a5..c3afe021e5c5e1f0e65fc27a7921452ab8118726 100644
--- a/pkg/compiler/lib/src/compile_time_constants.dart
+++ b/pkg/compiler/lib/src/compile_time_constants.dart
@@ -4,9 +4,9 @@
 
 library dart2js.compile_time_constant_evaluator;
 
-import 'common.dart';
 import 'common/resolution.dart' show Resolution;
 import 'common/tasks.dart' show CompilerTask, Measurer;
+import 'common.dart';
 import 'compiler.dart' show Compiler;
 import 'constant_system_dart.dart';
 import 'constants/constant_system.dart';
@@ -18,11 +18,11 @@ import 'dart_types.dart';
 import 'elements/elements.dart';
 import 'elements/modelx.dart'
     show FieldElementX, FunctionElementX, ConstantVariableMixin;
-import 'resolution/tree_elements.dart' show TreeElements;
 import 'resolution/operators.dart';
+import 'resolution/tree_elements.dart' show TreeElements;
 import 'tree/tree.dart';
-import 'util/util.dart' show Link;
 import 'universe/call_structure.dart' show CallStructure;
+import 'util/util.dart' show Link;
 
 /// A [ConstantEnvironment] provides access for constants compiled for variable
 /// initializers.