Enable testSaveDangerousFile on win

chrome/test/functional/PYAUTO_TESTS

 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 # This file lists the pyauto tests that run as a part of the functional test
 # suite.
 #
 # Tests can be enabled on a per-platform basis. Tests not listed here will
 # not be run.
 #
@@ skipping 110 matching lines @@
       '-nacl_sdk.NaClSDKTest.testVerifyNaClPlugin',
       # crbug.com/105560
       '-notifications',
     ],
 
     'win': [
       # Enable sync.SyncIntegrationTest only for windows CONTINUIOUS,
       # which contains the sync protobufs.
       #'sync.SyncIntegrationTest',
 
-      # crbug.com/104886 - cannot trigger dangerous download.
-      '-downloads.DownloadsTest.testSaveDangerousFile',
-
       # ==================================================
       # Disabled tests that need to be investigated/fixed.
       # ==================================================
       # Some download test fails on win official builder, only thru buildbot
       # when downloading the small zip file.
       # crbug.com/91225
       '-find_in_page.FindMatchTests.testSearchInPDF',
       # Disabled on vista in the actual test. crbug.com/89767
       # -imports.ImportsTest.testImportFirefoxDataTwice
       # Disabled on vista in the actual test. crbug.com/89767
@@ skipping 474 matching lines @@
 
   # HTML5 media functional tests.
   'AV_FUNC': {
      'linux': [
        'media.media_event_simple_action',
        'media.media_event_simple_test',
        'media.media_event_track',
      ],
   },
 }