dart2js: run dartfmt on tests

tests/compiler/dart2js/map_tracer_const_test.dart

Index: tests/compiler/dart2js/map_tracer_const_test.dart
diff --git a/tests/compiler/dart2js/map_tracer_const_test.dart b/tests/compiler/dart2js/map_tracer_const_test.dart
index 1bb6ca09546f9b67685b76319d296fb62606a0db..ee20f9fdac1d141d4ea697c3ff26a07bc0edeb29 100644
--- a/tests/compiler/dart2js/map_tracer_const_test.dart
+++ b/tests/compiler/dart2js/map_tracer_const_test.dart
@@ -30,14 +30,13 @@ main() {
 
 void main() {
   Uri uri = new Uri(scheme: 'source');
-  var compiler = compilerFor(TEST, uri,
-      expectedErrors: 0, expectedWarnings: 0);
+  var compiler = compilerFor(TEST, uri, expectedErrors: 0, expectedWarnings: 0);
   compiler.stopAfterTypeInference = true;
   asyncTest(() => compiler.run(uri).then((_) {
-    var commonMasks = compiler.commonMasks;
-    var typesInferrer = compiler.globalInference.typesInferrer;
-    var element = findElement(compiler, 'closure');
-    var mask = typesInferrer.getReturnTypeOfElement(element);
-    Expect.equals(commonMasks.numType, simplify(mask, compiler));
-  }));
+        var commonMasks = compiler.commonMasks;
+        var typesInferrer = compiler.globalInference.typesInferrer;
+        var element = findElement(compiler, 'closure');
+        var mask = typesInferrer.getReturnTypeOfElement(element);
+        Expect.equals(commonMasks.numType, simplify(mask, compiler));
+      }));
 }