Fix build breakage caused from revision 5341 in Windows.

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 680 matching lines @@
       case 'webdriver':
         return 'text/javascript';
       default:
         Expect.fail('Unimplemented component scriptType');
         return null;
     }
   }
 
   String getHtmlName(String filename) {
     return filename.replaceAll('/', '_').replaceAll(':', '_')
-        + configuration['component'] + '.html';
+        .replaceAll('\\', '_') + configuration['component'] + '.html';

[Bill Hesse, 2012/03/13 00:26:22]

OK, but I don't know why we don't fix filename when we first get it, rather than
fixing it at many different later places.  I'll fix this someday.

[Emily Fortuna, 2012/03/13 00:33:51]

I'm fine with fixing it initially -- it's just all the Windows bots were broken
at the time, and I needed to get a fix in quickly before more tests broke.

   }
 
   String get dumpRenderTreeFilename() {
     if (configuration['drt'] != '') {
       return configuration['drt'];
     }
     if (new Platform().operatingSystem() == 'macos') {
       return '$dartDir/client/tests/drt/DumpRenderTree.app/Contents/' +
           'MacOS/DumpRenderTree';
     }
@@ skipping 522 matching lines @@
  * $noCrash tests are expected to be flaky but not crash
  * $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
 """;
     print(report);
    }
 }