Enable testSaveDangerousFile on win

I had fixed it in r111201

R=dennisjeffrey@chromium.org
BUG=104886
TEST=

Review URL: http://codereview.chromium.org/8866001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113481 0039d316-1c4b-4281-b951-d872f2087c98

chrome/test/functional/PYAUTO_TESTS

@@ -128,9 +128,6 @@
       # 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.
       # ==================================================