Bugfix in test_runner.dart

tools/testing/dart/test_suite.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Classes and methods for enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
@@ skipping 1177 matching lines @@
     }
   }
 
   String get contentShellFilename {
     if (configuration['drt'] != '') {
       return configuration['drt'];
     }
     if (Platform.operatingSystem == 'macos') {
       final path = dartDir.append(
           '/client/tests/drt/Content Shell.app/Contents/MacOS/Content Shell');
-      return '"${path.toNativePath()}"';
+      return path.toNativePath();
     }
     return dartDir.append('client/tests/drt/content_shell').toNativePath();
   }
 
   String get dartiumFilename {
     if (configuration['dartium'] != '') {
       return configuration['dartium'];
     }
     if (Platform.operatingSystem == 'macos') {
       return dartDir.append('client/tests/dartium/Chromium.app/Contents/'
@@ skipping 737 matching lines @@
  * $pass tests are expected to pass
  * $failOk tests are expected to fail that we won't fix
  * $fail tests are expected to fail that we should fix
  * $crash tests are expected to crash that we should fix
  * $timeout tests are allowed to timeout
  * $compileErrorSkip tests are skipped on browsers due to compile-time error
 """;
     print(report);
    }
 }