dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/this_redirecting_constructor_test.dart

Index: tests/compiler/dart2js_extra/this_redirecting_constructor_test.dart
diff --git a/tests/compiler/dart2js_extra/this_redirecting_constructor_test.dart b/tests/compiler/dart2js_extra/this_redirecting_constructor_test.dart
index 101aa1cf01c828a84c14e3a7f3f3cd9b9dd9b667..feeedd434efc85ea90cbe488f549278879786c91 100644
--- a/tests/compiler/dart2js_extra/this_redirecting_constructor_test.dart
+++ b/tests/compiler/dart2js_extra/this_redirecting_constructor_test.dart
@@ -10,9 +10,13 @@ import "package:expect/expect.dart";
 
 class C {
   var x;
-  C() { x = 1; }
-  C.C() { x = 2; }
-  C.redirecting(): this.C();
+  C() {
+    x = 1;
+  }
+  C.C() {
+    x = 2;
+  }
+  C.redirecting() : this.C();
 }
 
 main() {