dart2js: run dartfmt on tests

tests/compiler/dart2js_native/native_field_invocation4_test.dart

Index: tests/compiler/dart2js_native/native_field_invocation4_test.dart
diff --git a/tests/compiler/dart2js_native/native_field_invocation4_test.dart b/tests/compiler/dart2js_native/native_field_invocation4_test.dart
index e0a5c002f545545fb55225db4e3e2618d1802ec5..18489d5926ea2425fcb0218d3f8b4561fb93a321 100644
--- a/tests/compiler/dart2js_native/native_field_invocation4_test.dart
+++ b/tests/compiler/dart2js_native/native_field_invocation4_test.dart
@@ -14,7 +14,7 @@ class B {
   var foo;
 }
 
-nativeId(x) native;
+nativeId(x) native ;
 
 void setup() native """
 nativeId = function(x) { return x; }
@@ -24,7 +24,7 @@ main() {
   setup();
   var b = new B();
   b.foo = (x) => x + 1;
-  b = nativeId(b);  // Inferrer doesn't know if A has been instantiated.
+  b = nativeId(b); // Inferrer doesn't know if A has been instantiated.
   // At this point b could be A or B. The call to "foo" thus needs to go through
   // an interceptor. Tests that the interceptor doesn't screw with retrieving
   // the field and invoking the closure.