Get Firefox on Windows running.

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.
 
 #library("test_suite");
 
 #import("dart:io");
 #import("status_file_parser.dart");
 #import("test_runner.dart");
 #import("multitest.dart");
@@ skipping 410 matching lines @@
         String htmlFilename = getHtmlName(filename);
         while ('${tempDir.path}/../../$htmlFilename'.length >= 260) {
           htmlFilename = htmlFilename.substring(htmlFilename.length~/2);
         }
         htmlPath = '${tempDir.path}/../../$htmlFilename';
       }
       final String scriptPath = (component == 'dartium') ?
           dartWrapperFilename : compiledDartWrapperFilename;
       // Create the HTML file for the test.
       RandomAccessFile htmlTest = new File(htmlPath).openSync(FileMode.WRITE);
+      String filePrefix = '';
+      if (new Platform().operatingSystem() == 'windows') {
+        // Firefox on Windows does not like absolute file path names that start
+        // with 'C:' adding 'file:///' solves the problem.
+        filePrefix = 'file:///';
+      }
       htmlTest.writeStringSync(GetHtmlContents(
           filename,
-          '$dartDir/client/testing/unittest/test_controller.js',
+          '$filePrefix$dartDir/client/testing/unittest/test_controller.js',
           scriptType,
-          scriptPath));
+          filePrefix + scriptPath));
       htmlTest.closeSync();
 
       List<String> compilerArgs = TestUtils.standardOptions(configuration);
       String compilerExecutable = TestUtils.compilerPath(configuration);
       switch (component) {
         case 'chromium':
           compilerArgs.addAll(['--work', tempDir.path]);
           if (configuration['mode'] ==  'release') {
             compilerArgs.add('--optimize');
           }
@@ skipping 614 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);
    }
 }