dart2js: run dartfmt on tests

tests/compiler/dart2js_native/native_field_optimization_test.dart

Index: tests/compiler/dart2js_native/native_field_optimization_test.dart
diff --git a/tests/compiler/dart2js_native/native_field_optimization_test.dart b/tests/compiler/dart2js_native/native_field_optimization_test.dart
index 405dccc24674e5e317862091206955daaaf5de3f..a24be4344506476aa2732bd5d72486113d3b9e84 100644
--- a/tests/compiler/dart2js_native/native_field_optimization_test.dart
+++ b/tests/compiler/dart2js_native/native_field_optimization_test.dart
@@ -17,7 +17,7 @@ class Foo {
   var ab;
 }
 
-Foo makeFoo() native;
+Foo makeFoo() native ;
 
 void setup() native """
 function Foo() { this.i = 0; }
@@ -44,7 +44,6 @@ Object.defineProperty(Foo.prototype, 'ab', {
 makeFoo = function() { return new Foo() }
 """;
 
-
 test1() {
   var f = makeFoo();
   f.a = 'Hi';