dart2js: run dartfmt on tests

tests/compiler/dart2js/deferred_load_graph_segmentation2_test.dart

Index: tests/compiler/dart2js/deferred_load_graph_segmentation2_test.dart
diff --git a/tests/compiler/dart2js/deferred_load_graph_segmentation2_test.dart b/tests/compiler/dart2js/deferred_load_graph_segmentation2_test.dart
index 52ad4d4240d81e6405ce59a34a629608776b383f..1320fe2614fdb9d2b278e2b7a3dfe232a84a773c 100644
--- a/tests/compiler/dart2js/deferred_load_graph_segmentation2_test.dart
+++ b/tests/compiler/dart2js/deferred_load_graph_segmentation2_test.dart
@@ -37,7 +37,8 @@ void main() {
 // lib1 and lib2 also import lib4 deferred, but lib1 uses lib4.bar1 and lib2
 // uses lib4.bar2.  So two output units should be created for lib4, one for each
 // import.
-const Map MEMORY_SOURCE_FILES = const {"main.dart": """
+const Map MEMORY_SOURCE_FILES = const {
+  "main.dart": """
 import "dart:async";
 
 import 'lib.dart' deferred as lib show f1;
@@ -49,7 +50,8 @@ void main() {
     print(lib.f1());
   });
 }
-""", "lib.dart": """
+""",
+  "lib.dart": """
 int f1 () {
   return 1;
 }
@@ -57,4 +59,5 @@ int f1 () {
 int f2 () {
   return 2;
 }
-""",};
+""",
+};