Format all tests.

tests/language/scanner_test.dart

 // Copyright (c) 2011, 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.
 // Test dart scanner.
 
 class ScannerTest {
   static testMain() {
     var s = "Hello\tmy\tfriend\n";
     return s;
   }
 }
+
 main() {
   ScannerTest.testMain();
 }