dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/async_stacktrace_test.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "dart:async";
 
 import "package:expect/expect.dart";
 import "package:async_helper/async_helper.dart";
 
 class Tracer {
   final String expected;
   final String name;
   String _trace = "";
 
   Tracer(this.expected, [this.name]);
 
   void trace(msg) {
     if (name != null) {
       print("Tracing $name: $msg");
     }
     _trace += msg;
   }
 
   void done() {
     Expect.equals(expected, _trace);
   }
 }
 
 test1(Tracer tracer) {
-  foo() async
-              * /// asyncStar: ok
-               {
+  foo() async*
+
+  /// asyncStar: ok
+  {
     var savedStackTrace;
     try {
       try {
         tracer.trace("a");
         throw "Error";
       } catch (e, st) {
         tracer.trace("b");
         savedStackTrace = st;
       }
       tracer.trace("c");
       await new Future.error("Error 2", savedStackTrace);
       tracer.trace("d");
     } catch (e, st) {
       tracer.trace("e");
       Expect.equals(savedStackTrace.toString(), st.toString());
     }
     tracer.trace("f");
   }
-  return foo()
-      .toList() /// asyncStar: continued
-               ;
+  return foo().toList()
+
+      /// asyncStar: continued
+      ;
 }
 
 test2(Tracer tracer) {
   var savedStackTrace;
-  foo() async
-              * /// asyncStar: continued
-               {
+  foo() async*
+
+  /// asyncStar: continued
+  {
     try {
       tracer.trace("a");
       throw "Error";
     } catch (e, st) {
       tracer.trace("b");
       savedStackTrace = st;
     }
     tracer.trace("c");
     await new Future.error("Error 2", savedStackTrace);
     tracer.trace("d");
   }
-  return foo()
-      .toList() /// asyncStar: continued
+  return foo().toList()
+
+      /// asyncStar: continued
       .catchError((e, st) {
     tracer.trace("e");
     Expect.equals(savedStackTrace.toString(), st.toString());
   });
 }
 
 test3(Tracer tracer) {
   var savedStackTrace;
-  foo() async
-              * /// asyncStar: continued
-                {
+  foo() async*
+
+  /// asyncStar: continued
+  {
     try {
       tracer.trace("a");
       throw "Error";
     } catch (e, st) {
       tracer.trace("b");
       savedStackTrace = st;
       rethrow;
     }
   }
-  return foo()
-      .toList() /// asyncStar: continued
+  return foo().toList()
+
+      /// asyncStar: continued
       .catchError((e, st) {
     tracer.trace("c");
     Expect.equals(savedStackTrace.toString(), st.toString());
   });
 }
 
 runTest(String expectedTrace, Future test(Tracer tracer)) async {
   Tracer tracer = new Tracer(expectedTrace);
   await test(tracer);
   tracer.done();
 }
 
 runTests() async {
   await runTest("abcef", test1);
   await runTest("abce", test2);
   await runTest("abc", test3);
 }
 
 main() {
   asyncTest(runTests);
-}
+}